\E*pim"e*ron\, n.; pl. {Epimera}. [NL., fr. Gr. 'epi`
upon + ? a part.] (Zo["o]l.)
(a) In crustaceans: The part of the side of a somite external
    to the basal joint of each appendage. See Illust. under
    {Crustacea}.
(b) In insects: The lateral piece behind the episternum.
    [Written also {epimerum}.]