The Collaborative International Dictionary
Petrohyoid
Petrohyoid \Pet`ro*hy"oid\, a. [Petro + hyoid.] (Anat.) Pertaining to petrous, oe periotic, portion of the skull and the hyoid arch; as, the petrohyoid muscles of the frog.
Wiktionary
petrohyoid
a. (context anatomy English) Pertaining to the petrous, or periotic, portion of the skull and the hyoid arch. n. (context anatomy English) A muscle of this kind.