资料来源 : pyDict

牙形石

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Conodont \Co"no*dont\, n. [Gr. ? cone + ?, ?, tooth.] (Zo["o]l.)
   A peculiar toothlike fossil of many forms, found especially
   in carboniferous rocks. Such fossils are supposed by some to
   be the teeth of marsipobranch fishes, but they are probably
   the jaws of annelids.

资料来源 : WordNet®

conodont
     n 1: tiny fossil cone-shaped tooth of the most primitive
          vertebrate: the conodont
     2: small (2 in) extinct eellike fish with a finned tail and a
        notochord and having cone-shaped teeth containing cellular
        bone; late Cambrian to late Triassic; possible predecessor
        of the cyclostomes