The Collaborative International Dictionary of English v.0.48:

turbo \tur"bo\, n. [L. turbo, -inis, a top. See Turbine.]
   (Zool.)
   Any one of numerous marine gastropods of the genus Turbo or
   family Turbinidae, usually having a turbinate shell, pearly
   on the inside, and a calcareous operculum.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

turbo- \tur"bo-\, n.
   Sontaining or using a turbine; -- a combining form; as,
   turbojet.
   [1913 Webster]