Pet′ro‐hy″oid (pĕt′rō̍‐hī″oid), a. [Petro + hyoid.] (Anat.) Pertaining to the petrous, or periotic, portion of the skull and the hyoid arch; as, the petrohyoid muscles of the frog.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.