Hȳ-pō'py-on or Hȳ-pō'py-ūme, n.

n. [Gr. ὑπόπυον, neut. -ον, mixed with pus, from ὑπό, under, and πύον, or πύον, matter, pus; Fr. hypopyon.] (Med.) (a.) An abscess in the eye. (b.) An effusion of pus into the chambers of the eye. Dunglison.