make-and-break mechanism
81Plate tectonics — The tectonic plates of the world were mapped in the second half of the 20th century …
82Naval mine — Polish wz. 08/39 contact mine. The protuberances around the top of the mine, called Hertz horns, are part of the detonation mechanism …
83computer science — computer scientist. the science that deals with the theory and methods of processing information in digital computers, the design of computer hardware and software, and the applications of computers. [1970 75] * * * Study of computers, their… …
84military technology — Introduction range of weapons, equipment, structures, and vehicles used specifically for the purpose of fighting. It includes the knowledge required to construct such technology, to employ it in combat, and to repair and replenish it.… …
85police — /peuh lees /, n., v., policed, policing. n. 1. Also called police force. an organized civil force for maintaining order, preventing and detecting crime, and enforcing the laws. 2. (used with a pl. v.) members of such a force: Several police are… …
86Disc brake — Close up of a disc brake on a car On automobiles, disc brakes are often located with …
87blood — bloodlike, adj. /blud/, n. 1. the fluid that circulates in the principal vascular system of human beings and other vertebrates, in humans consisting of plasma in which the red blood cells, white blood cells, and platelets are suspended. 2. the… …
88dormancy — /dawr meuhn see/, n. the state of being dormant. [1780 90; DORM(ANT) + ANCY] * * * ▪ biology Introduction state of reduced metabolic activity adopted by many organisms under conditions of environmental stress or, often, as in winter, when… …
89mining — /muy ning/, n. 1. the act, process, or industry of extracting ores, coal, etc., from mines. 2. the laying of explosive mines. [1250 1300; ME: undermining (walls in an attack); see MINE2, ING1] * * * I Excavation of materials from the Earth s… …
90United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
