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collet a metal ring or rim that holds a jewel or watch spring. [2 definitions]
collide to strike or bump into one another forcefully. [2 definitions]
collider in nuclear physics, a type of accelerator in which occurs the bombardment of certain charged particles by certain others, such as electrons and positrons; colliding-beam machine.
collie one of a breed of large dogs originating in Scotland as sheep dogs and having long pointed muzzles and long-haired coats.
collier a coal miner, esp. in Great Britain. [2 definitions]
colliery a coal mine, esp. in Great Britain, including the buildings and equipment associated with it.
collimate to line up or make parallel (rays of light). [2 definitions]
collimator a small telescope that is fixed to a larger one and is used to align it accurately. [2 definitions]
collinear lying in the same straight line. [2 definitions]
collins (often cap.) a drink made with lemon or lime juice, carbonated water, sugar, and either gin, vodka, whiskey, or rum.
collision an act or instance of coming together with violent force; crash. [2 definitions]
collocate to place together or put in correct order; arrange.
collocation in linguistics, the tendency of certain words to occur together in speech or writing with more frequency than chance would predict, or the particular ways that words tend to combine with each other within a particular language. [2 definitions]
collodion in chemistry, a thick solution of pyroxylin suspended in alcohol and ether, used in producing photographic film, in cementing surgical bandages and sealing wounds, and in engraving and lithography.
colloid in chemistry, a suspension of a very finely ground or divided substance in a gas, liquid, or solid, such that suspended particles tend not to settle out. [3 definitions]
colloidal of, resembling, or containing a colloid. [2 definitions]
colloq. abbreviation of "colloquial" or "colloquially."
colloquial characteristic of or suited to informal or familiar conversation or to writing that is imitative of conversational tone. [2 definitions]
colloquialism a colloquial or informal word or phrase, sometimes characteristic of a particular region.
colloquium an informal group meeting or conference. [2 definitions]
colloquy a conversation or written dialogue, esp. one with a formal setting and purpose.