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Vital Scientific Terms (L)
Terms in this set (96)
A room or building equipped for scientific experimentation or research.
The membranous system of cavities and canals that occurs in the vertebrate inner ear and contains a fluid (endolymph).
A resinous substance deposited on the twigs of various trees by the female lac insect; used in the manufacture of varnishes, sealing wax, shellac, and in the production of a red coloring matter.
A mass of igneous rock formed by intrusion beneath other rocks.
The period during which milk is produced by the mammary glands.
Lactic Acid Bacteria
A group of bacteria that ferment carbohydrates in the presence or absence of oxygen, with lactic acid always a major end product.
A coastal body of shallow water formed where low-lying rock, sand, or coral presents a partial barrier to the open sea.
A landslide of wet volcanic debris on the side of a volcano.
A pigment consisting of organic coloring matter with an inorganic, usually metallic base or carries, used in dyes, inks, and paints; a large body of fresh or salt water surrounded by land.
Flow of a fluid in a straight path parallel to its direction of movement.
The collapse of part of a mountainside or cliff so that it descends in a disintegrating mass of rocks and earth.
A silvery ductile metallic element resembling aluminum that belongs to the rare earth series and is used in the manufacture of glass.
The posterior division of the vertebrate intestine consisting of the cecum, colon and rectum and functioning especially in the removal of water from digestive residues to form feces.
The wingless immature worm-shaped form of many insects that develops into a pupa or chrysalis before becoming an adult insect.
Inflammation of the larynx, usually accompanied by hoarseness and coughing.
The part of the respiratory tract between the pharynx and the trachea, having walls of cartilage and muscle and containing the vocal cords.
An acronym for light amplification by stimulated emission of radiation; a device that produces a coherent beam of light by exciting atoms to a higher energy level.
The heat absorbed when a substance changes its state without a change in temperature.
Latent Heat of Fusion
The amount of thermal energy which must be absorbed or evolved for 1 mole of a substance to change states from a solid to a liquid or vice versa.
Latent Heat of Vaporization
The energy required to transform a given quantity of substance into a gas.
The time elapsed between exposure to a pathogenic organism, or chemical or radiation, and when symptoms and signs are first apparent.
Pertaining to the sides.
Referring to a liquid found in some flowering plants contained in special cells or vessels called laticifier.
The angular distance north or south of the Earth's equator, measured in degrees along a meridian.
Also called Bravais lattice, crystal lattice, space lattice; an arrangement in space of isolated points (lattice points) in a regular pattern, showing the positions of atoms, molecules, or ions in the structure of a crystal.
Inhalation anesthetic used as an anesthetic in dentistry and surgery; nitrous oxide.
Molten rock that flows from a volcano or from a fissure on land and or on the ocean floor.
Law of Chemical Equilibrium
The mass action expression for a reversible reaction is equal to a constant.
Law of Conservation of Energy
The fundamental principle of physics that the total energy of an isolated system is constant despite internal changes.
Law of Conservation of Mass
A fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system.
Law of Conservation of Momentum
The total momentum of any group of objects remains the same unless outside forces act on the objects.
Law of Multiple Proportions
States that when two elements can combine to form more than one compound, the amounts of one of them that combines with a fixed amount of the other will exhibit a simple multiple relation.
Law of Reflection
When a ray of lights reflects off a surface, the angle of incidence is equal to the angle of reflection.
Law of Universal Gravitation
Also known as Newton's law, it states that all objects in the universe attract each other by the force of gravity.
A short-lived radioactive metallic element that was first produced artificially from californium and later from other elements.
A heavy bluish gray metallic chemical element that bends easily.
Any of the flat green parts that grow in various shapes from the stems or branches of plants and trees and whose main function is photosynthesis.
A tide running in the same direction that the wind blows.
A simple dry fruit which develops from a simple carpel and usually dehisces (opens along a seam) on two sides. Many of this are widely cultivates for food, as fodder for livestock, and as a means of improving the nitrogen content of soils.
A transparent biconvex body of the eye between the iris and the vitreous humor that focuses light rays entering through the pupil to form an image on the retina.
A pore on the outer layer of a woody plant stem, through which gases pass from inside the stem to the atmosphere, or vice versa.
A butterfly or moth.
A chronic, mildly contagious disease of tropical and subtropical region characterized by ulcers of the skin, bone, and viscera and leading to loss of sensation, paralysis, gangrene, and deformation; also called Hansen's disease.
A type of cancer in which white blood cells displace normal blood. This leads to infection, shortage of red blood cells (anemia), bleeding, and other disorders, and often proves fatal.
A simple machine consisting of a rigid bar pivoted on a fixed point and used to transmit force, as in raising or moving a weight at one end by pushing down on the other.
A fungus that grows symbiotically with algae, resulting in a composite organism that forms a crustlike or branching growth on rocks or tree trunks.
A sheet or band of tough fibrous tissue that connects bones or cartilage at a joint or supports an organ, muscle, or other body part.
An atom, molecule, group, or ion that is bound to a central atom of a molecule, forming a complex.
Also called luminous energy, radiant energy; electromagnetic radiation and may be perceived by the normal unaided human eye.
An abrupt, discontinuous natural electric discharge in the atmosphere.
A metal rod attached to the highest point of a building or other structure to protect it from lightning by conducting the lightning to the ground.
The distance that light travels in 1 year; i.e. 5.88 trillion miles or 9.46 trillion kilometers; often used to measure distances to stars.
A soft, brownish-black form of coal having more carbon than peat but less carbon than bituminous coal. It is a greater polluter than bituminous coal because it has a higher sulphur content.
A straplike structure, such as the corolla of a ray flower or a membranous or hairy appendage between the sheaf and blade of a grass leaf.
A common sedimentary rock consisting mostly of calcium carbonate, used as a building stone and in the manufacture of lime, carbon dioxide, and cement.
An environmental variable that limits or slows the growth or activities of an organism.
The chemical that determines how far the reaction will go before the chemical in question gets used up, causing the reaction to stop.
Linear Particle Accelerator
An electrical device for the acceleration of subatomic particles.
Lines of Force
Pattern around a magnet. The lines of force make up the magnetic field.
A medicinal liquid that is rubbed into the skin to relieve muscular stiffness and pain.
The proximity of two or more genes on a chromosome, which tends to cause them to be inherit together.
Either of the two fleshy folds around the mouth that help control eating, drinking, and the production of sounds by the mouth.
Any of a group of organic compounds consisting of fats, oils, and related substances that, along with proteins and carbohydrates, are the structural components of living cells.
A tiny artificial sac formed from one or more layers of lipid, used medicinally to carry a drug, vaccine, or enzyme to targeted cells in the body.
Matter with no definite shape but with a definite volume.
A rod-shaped aerobic parasitic bacterium that causes disease, especially listeriosis.
The basic unit of liquid volume or capacity in the metric system, equal to 1.06 quart or 2.12 pints.
The process by which unconsolidated sediments are converted into solid stone or rock.
A soft silver-white chemical element that is the lightest metal known, used in alloys, ceramics, and batteries, and in compounds as a medical treatment for manic-depressive disorders.
A colored dye used to coat special strips of paper called litmus paper. It is an indicator.
A large, reddish-brown, glandular vertebrate organ located in the upper right portion of the abdominal cavity that secretes bile and is active in the formation of certain blood proteins and in the metabolism of carbohydrates, fats, and proteins.
An easily-worked fertile soil consisting of a mixture of clay, sand, and silt and sometimes also organic matter.
Any of numerous grasshoppers of the family Acrididae, often migrating in immense swarms that devour vegetation and crops.
One of two or three small rounded bodies at the base of the carpel of a grass flower. The swelling of the lodicules forces apart the flower's bracts, exposing the flower's reproductive organs.
A wind-blown deposit of fine-grained clay, silt, and very fine sand covering a wide area.
The branch of philosophy that deals with the theory of deductive and inductive arguments and aims to distinguish good from bad reasoning.
The range of radio frequencies lying between 148.5 and 283.5 kHz, corresponding to wavelengths between 1000 and 2000 meters. Reception distance on longwave is similar to that on the AM broadcast band.
The time when the sea is lowest at a particular place during ebb tide.
A substance, like oil or grease, used to lessen friction, especially in the working parts of a mechanism.
A painful condition of the lower back, as one resulting from muscle strain or a slipped disk.
The central space within a tube-shaped body part or organ, such as a blood vessel or the intestine.
Emission of light by means other than combustion and therefore occurring at lower temperatures than are required for combustion.
Relating to a moon or its movement around a planet, especially the Moon in relation to the Earth.
Occurs when the Earth if between the Sun and the Moon. The shadow of the Earth falls on the moon.
In air-breathing vertebrate animals, either of the paired spongy respiratory organs, situated inside the rib cage, that transfer oxygen into the blood and remove carbon dioxide from it.
The respiratory organs of arachnids, consisting of a cavity containing leaf like folds of the body wall.
A silvery-white metallic chemical element that belongs to the rare-earth series.
A fluid containing white cells, chiefly lymphocytes, that is drained from tissue spaces by the vessels of the lymphatic system.
Any of the small bodies located along the lymphatic vessels, particularly at the neck, armpit, and groin, that filter bacteria and foreign particles from lymph fluid. During infection, these may become swollen with activated lymphocytes; also called lymph gland.
An important cell class in the immune system that produces antibodies to attack infected and cancerous cells, and is responsible for rejecting foreign tissue.
Any of various soluble substances released by lymphocytes during an immune response that influence the behavior of other immune cells. They are now included in the more general class of cytokines.
A malignant tumor originating in a lymph node, for example, Hodgkin's disease or any of the range of cancers known as non-Hodgkin's.
A crystalline, basic amino acid that occurs in nature as a component of proteins.
The ability of a bacterial cell to produce and release a bacterium-destroying virus (bacteriophage) in response to certain stimuli.
A cell organelle that is surrounded by a membrane, has an acidic interior, and contains hydrolytic enzymes that break down food molecules, especially proteins and other complex molecules.
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