||Tro"chus (?), n.; pl. Trochi (#). [NL., fr. Gr. &?; a wheel.] (Zoöl.) Any one of numerous species of marine univalve shells belonging to Trochus and many allied genera of the family Trochidæ. Some of the species are called also topshells.

||Tro"chus (?), n.; pl. Trochi (#). [NL., fr. Gr. &?; a wheel.] (Zoöl.) Any one of numerous species of marine univalve shells belonging to Trochus and many allied genera of the family Trochidæ. Some of the species are called also topshells.