11 terms

ch18

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canal lock
A gated chamber in a canal used to raise or lower the water level
segmental arch bridge
a bridge supported by arches that are shallow segments (parts) of a circle
moveable type
Individual characters made of wood or metal that can be arranged to create a job for printing and then used over again
porcelain
A hard, white pottery; also called china
mass-produce
To make similar items in quantity by using standardized designs and dividing labor among workers
gunpowder
An explosive powder made of saltpeter and other materials
alchemy
a combination of science, magic, and philosophy that was practiced in medieval times
catapult
A slingshot-like war machine used for shooting rocks, shells, and other objects
inoculate
to protect against disease by transmitting a disease-causing agent to a person, stimulating the body's defensive reactions
immune system
the body's system of defense against disease
vaccine
A substance used to immunize people against a disease
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