helodont,a.Palæont.|ˈhiːləʊdɒnt| [f.Gr. ἧλος nail + ὀδοντ- tooth.] Having teeth shaped like a nail or spike; (of a tooth) of this shape. 1886J. W. Davis in Geol.Mag. (N.S.) III. 151 A number of small helodont teeth are scattered over some of the pieces of limestone.