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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.
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.
collude to act together through a secret agreement or plan, esp. for illicit purposes; conspire.