conodont
Concise Oxford English Dictionary © 2008 Oxford University Press:
conodont /ˈkəʊnədɒnt/
▶noun Palaeontology an extinct marine creature with a long worm-like body and numerous small teeth, now believed to be the earliest vertebrate.
■ (also conodont element) a tooth of a conodont, often found as a fossil.
– origin C19: from mod. L. Conodonta (name of a class), from Gk kōnos ‘cone’ + odous, odont- ‘tooth’.
'conodont' also found in these Oxford entries:

