Source : Webster's Revised Unabridged Dictionary (1913)

Heteropoda \Het`e*rop"o*da\, n. pl. [NL., fr. Gr. ? other +
   -poda.] (Zo["o]l.)
   An order of pelagic Gastropoda, having the foot developed
   into a median fin. Some of the species are naked; others, as
   {Carinaria} and {Atlanta}, have thin glassy shells.