a. [ NL. strombulus, dim. of strombus + -form. See Strombus. ] 1. (Geol.) Formed or shaped like a top. [ 1913 Webster ]

2. (Bot.) Coiled into the shape of a screw or a helix. [ 1913 Webster ]

‖n. [ L., fr. Gr. &unr_;. ] (Zool.) A genus of marine gastropods in which the shell has the outer lip dilated into a broad wing. It includes many large and handsome species commonly called conch shells, or conchs. See Conch. [ 1913 Webster ]