From The Collaborative International Dictionary of English v.0.48 [gcide]:
Conodont \Co"no*dont\ (k[=o]"n[-o]*d[o^]nt), noun [Gr. kw^nos cone + 'odoy's, 'odo'ntos, tooth.] (Zool.) 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. Conodonta
From WordNet (r) 3.0 (2006) [wn]:
2: small (2 inches long) 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
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