• Webster's Revised Unabridged Dictionary
    • a Episternal (Anat. & Zoöl) Of or pertaining to the episternum.
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Century Dictionary and Cyclopedia
    • episternal In zoology, of or pertaining to the episternum; anterior, as a pleural sclerite.
    • n episternal In ichthyology, the lower median bone in the hyoid arch. Also called urohyal.
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In literature:

Occasionally, especially in young birds, rudiments of episternals and xiphisternals also occur.
"Form and Function" by E. S. (Edward Stuart) Russell