n. A beetle (Lytta, / Cantharis, vesicatoria), havin1g an\n elongated cylindrical body of a brilliant green color, and a nauseous\n odor; the blister fly or blister beetle, of the apothecary; -- also\n called Spanish fly. Many other species of Lytta, used for the same\n purpose, take the same name. See Blister beetle, under Blister. The\n plural form in usually applied to the dried insects used in medicine.