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brittlestar

(Encyclopedia)brittlestar, common name for echinoderms belonging to the class Ophiuroidea. The name is derived from their habit of breaking off arms as a means of defense. New arms are easily regenerated. They are ...

cavalry

(Encyclopedia)cavalry, a military force consisting of mounted troops trained to fight from horseback. Horseback riding probably evolved independently in the Eurasian steppes and the mountains above the Mesopotamian...

resuscitator

(Encyclopedia)resuscitator rĭsŭsˈĭtāˌtər [key], device used to revive a person whose normal breathing has been disrupted. Several types are in wide use. The automatic tank resuscitator consists of a face mas...

International Campaign to Abolish Nuclear Weapons

(Encyclopedia)International Campaign to Abolish Nuclear Weapons (ICAN), coalition of nongovernmental organizations that was formed in 2007 to advocate for the banning of nuclear weapons. It is based in Geneva, Swit...

tank, military

(Encyclopedia)tank, military, armored vehicle having caterpillar traction and armed with machine guns, cannon, rockets, or flame throwers. The tank, together with the airplane, opened up modern warfare, which had b...

control systems

(Encyclopedia)control systems, combinations of components (electrical, mechanical, thermal, or hydraulic) that act together to maintain actual system performance close to a desired set of performance specifications...

servomechanism

(Encyclopedia)servomechanism, automatic device for the control of a large power output by means of a small power input or for maintaining correct operating conditions in a mechanism. It is a type of feedback contro...

musket

(Encyclopedia)musket: see small arms.

shotgun

(Encyclopedia)shotgun: see small arms.

pistol

(Encyclopedia)pistol: see small arms.