epiotic

from The Century Dictionary.

• Literally, upon the ear: applied to a center of ossification in the mastoid region of the periotic bone.
• noun In zoology and anatomy, one of the three principal bones or separate ossifications which compose the periotic bone or auditory capsule: distinguished from the proötic and the opisthotic, and also from the pterotic when this fourth element is present.
• noun One of the outer or lateral pair of the supratemporal bones in the cranial roof of the stegocephalian Amphibia, regarded as bones of dermal origin.
• noun In ichthyology, a lateral, posterior paired bone of the cranium, usually forming a blunt projection.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Anat.) The upper and outer element of periotic bone, -- in man forming a part of the temporal bone.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun anatomy The upper and outer element of periotic bone, in humans forming a part of the temporal bone.