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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...

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...

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...

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 ...

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...

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...

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...

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...

Klee, Paul

(Encyclopedia)Klee, Paul poul klā [key], 1879–1940, Swiss painter, graphic artist, and art theorist, b. near Bern. Klee's enormous production (more than 10,000 paintings, drawings, and etchings) is unique in tha...