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From The Collaborative International Dictionary of English v.0.48:
Cornet \Cor"net\ (k?r"n?t), n. [F. cornet, m. (for senses 1 & 2), cornette, f. & m. (for senses 3 & 4), dim. of corne horn, L. cornu. See Horn.] 1. (Mus.) (a) An obsolete rude reed instrument (Ger. Zinken), of the oboe family. (b) A brass instrument, with cupped mouthpiece, and furnished with valves or pistons, now used in bands, and, in place of the trumpet, in orchestras. See Cornet-[`a]-piston. (c) A certain organ stop or register. [1913 Webster] 2. A cap of paper twisted at the end, used by retailers to inclose small wares. --Cotgrave. [1913 Webster] 3. (Mil.) (a) A troop of cavalry; -- so called from its being accompanied by a cornet player. [Obs.] "A body of five cornets of horse." --Clarendon. (b) The standard of such a troop. [Obs.] (c) The lowest grade of commissioned officer in a British cavalry troop, who carried the standard. The office was abolished in 1871. [1913 Webster] 4. A headdress: (a) A square cap anciently worn as a mark of certain professions. (b) A part of a woman's headdress, in the 16th century. [1913 Webster] 5. [Cf. Coronet.] (Far.) See Coronet, 2. [1913 Webster]