Definitions

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.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

epi- + Ancient Greek ear.

Examples

  • A third (pterotic) roofs in the tympanic cavity and antrum; while the fourth (epiotic) appears near the posterior semicircular canal and extends to form the mastoid process (Vrolik).

    II. Osteology. 5a. 4. The Temporal Bone

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