Definition of opisthognathous in English:

opisthognathous

Syllabification: op·is·thog·na·thous
Pronunciation: /ˌäpəsˈTHäɡnəTHəs/

Entry from US English dictionary

adjective

Zoology
(Of an animal) having retreating jaws or teeth.

Definition of opisthognathous in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal