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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.
collude to act together through a secret agreement or plan, esp. for illicit purposes; conspire.
collusion the act or process of colluding. [2 definitions]
colo- colon or large intestine.
cologne a fragrant liquid mixture of alcohol and scented oils, used to cool or perfume the skin; eau de Cologne.
Colombia a South American country between Venezuela and the Pacific Ocean.
Colombian of or pertaining to Colombia or its people, culture, or the like. [2 definitions]