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poison gas

(Encyclopedia)poison gas, any of various gases sometimes used in warfare or riot control because of their poisonous or corrosive nature. These gases may be roughly grouped according to the portal of entry into the ...

Zizka, John

(Encyclopedia)Zizka, John yän zhēshˈkä [key], d. 1424, Bohemian military leader and head of the Hussite forces during the anti-Hussite crusades of Holy Roman Emperor Sigismund. Before the Hussite Wars, which ga...

Strafford, Thomas Wentworth, 1st earl of

(Encyclopedia)Strafford, Thomas Wentworth, 1st earl of, 1593–1641, English statesman. Regularly elected to Parliament from 1614 on, he became one of the critics of George Villiers, 1st duke of Buckingham, and of ...

caterpillar

(Encyclopedia)caterpillar kătˈəpĭlˌər, kătˈər– [key], common name for the larva of a moth or butterfly. Caterpillars have distinct heads and are segmented and wormlike. They have three pairs of short, jo...

moss, in botany

(Encyclopedia)CE5 Life cycle of a moss: A germinating spore forms a transitory branching structure on the soil surface, which develops into the conspicuous gametophyte, the familiar moss plant. Eggs and sperm ar...

amyotrophic lateral sclerosis

(Encyclopedia)amyotrophic lateral sclerosis (ALS) āˌmīətrōfˈik, sklĭrōˈsĭs [key] or motor neuron disease, sometimes called Lou Gehrig's disease, degenerative disease that affects motor neurons in the brai...

corticosteroid drug

(Encyclopedia)corticosteroid drug kôrˌtəkōstârˈoid [key], any one of several synthetic or naturally occurring substances with the general chemical structure of steroids. They are used therapeutically to mimic...

electronic game

(Encyclopedia)electronic game, device or computer program that provides entertainment by challenging a person's eye-hand coordination or mental abilities. Made possible by the development of the microprocessor, ele...

Egyptian art

(Encyclopedia)Egyptian art, works of art created in the geographic area constituting the nation of Egypt. It is one of the world's oldest arts. The art of the New Kingdom (1570–1342 b.c.) can be viewed as th...

loom

(Encyclopedia)loom, frame or machine used for weaving; there is evidence that the loom has been in use since 4400 b.c. Modern looms are of two types, those with a shuttle (the part that carries the weft through the...

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