We found 2 dictionaries that define the word upper jaws:

General (2 matching dictionaries)

1. upper jaws: Collins English Dictionary
2. upper jaws: Vocabulary.com

(Note: See upper_jaw as well.)

Definitions from Wiktionary (upper jaw) ▸ noun:  (anatomy) Synonym of maxilla. ▸ Also see upper_jaw ▸ Words similar to upper jaws ▸ Usage examples for upper jaws ▸ Idioms related to upper jaws ▸ Wikipedia articles (New!) ▸ Words that often appear near upper jaws ▸ Rhymes of upper jaws ▸ Invented words related to upper jaws