Turbo \Tur"bo\, n. [L. turbo, -inis, a top. See Turbine.]

(Zo["o]l.) Any one of numerous marine gastropods of the genus Turbo or family Turbinid[ae], usually having a turbinate shell, pearly on the inside, and a calcareous operculum.

Source: Webster's Revised Unabridged Dictionary (1913)