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Copernican system the theory, first held by Copernicus, that the earth and other planets revolve around the sun.
copestone variant of capstone.
copier a machine used to make photographic copies of pages; photocopy machine. (See Xerox.) [2 definitions]
copilot one who is second in command to the pilot of an airplane.
coping the top layer of a masonry wall, often having a sloping surface so that water will run off.
coping saw a handsaw with a thin blade that is attached to the handle by a U-shaped frame, used for cutting curved shapes into wood.
copious abundant in number or quantity; plentiful.
copolymer a heavy compound produced by copolymerizing.
copolymerize to polymerize (two or more different monomers), or to undergo polymerizing.
cop out (informal) to avoid facing a responsibility or fulfilling a promise.
cop-out (informal) an instance or act of evading responsibility or not fulfilling a promise.
copper a chemical element that has twenty-nine protons in each nucleus and occurs as a reddish brown, corrosion-resistant solid metal with excellent electrical conductivity, widely used for wiring and in pipes, and in alloys such as brass and bronze. (symbol: Cu). [7 definitions]
copperas the chemical compound ferrous sulfate.
copperhead a venomous snake of the southeastern United States having a copper-colored body with darker bands. [2 definitions]
copperplate an engraved or etched flat plate of copper used in printing. [3 definitions]
coppersmith an artisan who makes utensils and art objects out of copper.
copper sulfate a poisonous blue crystalline copper compound, used in germicides, batteries, electroplating, and the like.
coppice variant of copse.
copra dried coconut flesh, from which oil is removed for use in various products.
copresident combined form of president.
coprince combined form of prince.