The Collaborative International Dictionary of English v.0.48:

Scaphopoda \Sca*phop"o*da\, n. pl. [NL., from Gr. ska`fh a boat
   + -poda.] (Zool.)
   A class of marine cephalate Mollusca having a tubular shell
   open at both ends, a pointed or spadelike foot for burrowing,
   and many long, slender, prehensile oral tentacles. It
   includes Dentalium, or the tooth shells, and other similar
   shells. Called also Prosopocephala, and Solenoconcha.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Scaphopoda
    n 1: small class of bilaterally symmetrical marine forms
         comprising the tooth shells [syn: Scaphopoda, class
         Scaphopoda]