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Beetle Bee"tle, n. [OE. bityl, bittle, AS. b[imac]tel, fr. b[imac]tan to bite. See Bite, v. t.] Any insect of the order Coleoptera, having four wings, the outer pair being stiff cases for covering the others when they are folded up. See Coleoptera. Beetle mite (Zo["o]l.), one of many species of mites, of the family Oribatid[ae], parasitic on beetles. Black beetle, the common large black cockroach (Blatta orientalis).