LSJ
οντος, ὁ, ἡ, (< ὀδούς) with incisor-teeth in both jaws, opp. ruminants, Arist. HA 501a11, cf. PA 675a5, HA 495b31, al. Subst., ass, Lyc. 1401. (Freq. written ἀμφόδων; cf. ἀμφόδους.)
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
οντος, ὁ, oben und unten Zähne habend (ὀδούς), Arist. H.A. 2.3.8 (Bekk. 2.1, p. 501.11). – Bei Lyc. 1401, der Esel.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)