Hypoarion
Pronunciation : Hy`po*a"ri*on
Part of Speech : n.;
Etymology : [NL., fr. Gr. (Anat.)
Definition : Defn: An oval lobe beneath each of the optic lobes in many fishes; one of the inferior lobes. Owen.
pl. Hypoaria.
Source : Webster's Unabridged Dictionary, 1913