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machine tool an automatic or semiautomatic power-driven tool, such as a punch press, lathe, or drill, used to cut or shape metal in the manufacturing of machines and machine parts.
machinist a person who is skilled in the operation, repair, or building of machines.
machinist's mate a petty officer trained to operate and repair ships' engines.
machismo masculinity as displayed in courage, assertiveness, and dominance, esp. over women.
Mach number (sometimes l.c.) the ratio of the speed of an object, or the flow of a fluid, to the speed that sound travels in the environment in which the object, or fluid, is moving; Mach.
macho embodying or demonstrating a conception of masculinity emphasizing strength, assertiveness, and dominance. [2 definitions]
Machu Picchu an extensive Inca ruin located in the Andes Mountains northwest of Cuzco, Peru.
Mackenzie River a river in Canada flowing from Great Slave Lake west and north toward the Arctic Ocean.
mackerel any of a number of related Atlantic food fish, esp. one with dark, wavy marks across the back and a silver underside. [2 definitions]
mackerel sky a sky mottled with rows or strings of small cirrocumulus or altocumulus clouds that resemble the markings of a mackerel.
mackinaw a heavy, short, double-breasted coat, usu. of heavily napped, plaid wool.
mackintosh a raincoat made of a waterproof, rubberized cloth. [2 definitions]
macramé a decorative hanging, trimming, or the like, heavier than lace, that is made by twisting, interlacing, and knotting cords. [2 definitions]
macro an abbreviated computer instruction that represents a particular sequence of instructions; macroinstruction. [2 definitions]
macro- great; large; long.
macrobiotic of or relating to macrobiotics or the dietary practice or foods characteristic of it. [2 definitions]
macrobiotics (used with a sing. verb) a philosophical view that emphasizes living in harmony with nature, esp. through a diet of whole grains and vegetables, which is thought to promote long life.
macrocephalic having a large, or abnormally large, skull with a large braincase.
macrocephaly the condition of having an abnormally large head or cranial capacity. (Cf. microcephaly.)
macroclimate the climate of a very large region such as a nation.
macrocosm the universe in its entirety. (Cf. microcosm.) [3 definitions]