• Webster's Revised Unabridged Dictionary
    • n Epiotic (Anat) The upper and outer element of periotic bone, -- in man forming a part of the temporal bone.
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Century Dictionary and Cyclopedia
    • epiotic Literally, upon the ear: applied to a center of ossification in the mastoid region of the periotic bone.
    • n epiotic 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. It is the superior and external one of the three, developed in special relation with the posterior semicircular canal of the ear. It usually forms part of the petrosal bone, or petrous portion of the temporal bone, and may be indistinguishably ankylosed therewith. See cuts under Crocodilia and Cyclodus.
    • n epiotic 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.
    • n epiotic In ichthyology, a lateral, posterior paired bone of the cranium, usually forming a blunt projection. It lies at the side of the supraoccipital behind the parietal, and articulates below with the exoccipital. The upper limb of the post-temporal is attached to it.
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Webster's Revised Unabridged Dictionary
Pref. epi-, + Gr. , gen. , ear


In literature:

The epiotic is often small, ossifies irregularly, and fuses with the supra-occipital.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7" by Various
The posterolateral margins of the frontoparietals lie medial to the epiotic eminences.
"A Synopsis of Neotropical Hylid Frogs, Genus Osteocephalus" by Linda Trueb