cēace, f.n: jaw, jawbone or mandible (frequently in the plural); perhaps also the jaw and the lower part of the face; upper part of the throat, cavity between the jaws. (CHAY-ah-chuh / ˈtʃeːa-tʃə)

Medieval manuscript image of naked humans sitting in flames in the sharp-toothed open jaws of a dark beast with red eyes.
Psalter; England (London), c. 1180; Bibliothèque Nationale de France, Latin 10433, f. 9r. [gallica.bnf.fr]