| Term | Definition |
|---|
| Gyro | turn |
| Gyration | a single complete turn |
| Spirogyra | freshwater algae consisting of minute filaments containing spiral chlorophyll bands |
| Gyrocompass | A north turn seeking form of gyroscope used as a directional reference in navigation |
| Contra | against |
| Contradict | against yourself |
| Contrast | dissimilarities in objects compared |
| Contraband | goods whose importation or exportation or possession is against the law |
| Geo | earth |
| Geothermal | of or relating to the heat in the interior of the earth |
| Geophysics | geology that uses physical principles to study properties of the earth |
| Geometry | part of mathematics concerned with questions of size, shape, and relative position of figures and with properties of space on earth. |
| Helio | sun |
| Heliotropic | growth towards sunlight by a plant |
| Heliocentric | with the sun at the center |
| Heliograph | signal by means of a mirror and the using the sun's rays |
| Thermo | heat |
| Thermostat | heat temperature regulator |
| Thermotropic | growth in relation to heat |
| Thermonuclear | of nuclear fission |
| Tetra | four |
| Tetrahedron | solid with four faces |
| Tetroxide | a compound that has four oxygen atoms per molecule |
| Tetrachloride | compound with four chlorine atoms |
| Meter | measure |
| Millimeter | measure of length in one thousandth of a meter |
| Hydrometer | density measuring instrument |
| Odometer | distance measuring device |
| Scope | look |
| Periscope | a long tubular instrument to look at things |
| Horoscope | to look at personality and future based on astrological data |
| Electroscope | device that looks for electrical charges and detects them. |
| Son | sound |
| Sonar | system for detecting underwater objects by transmitting sound waves and measure time it takes to echo. |
| Sonorous | producing sound |
| Dissonance | unpleasant noise |
| Dec | ten |
| Decimal | counted in groups of ten |
| Decathlon | contest involving ten track and field events |
| Decimate | kill one person out of ten |
| Stell | star |
| Interstellar | occurring between stars |
| Constellation | group of stars forming a shape |
| Stellate | star shaped |
| Amat | love |
| Amorous | expressing or feeling love |
| Amiable | friendly and pleasant/ lovely to be with |
| Amity | friendliness |
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