Source : Webster's Revised Unabridged Dictionary (1913)

Chemosis \Che*mo"sis\, n. [NL., fr. Gr. ? a swelling of the
   cornea resembling a cockleshell, fr. ? a gaping, hence a
   cockleshell.] (Med.)
   Inflammatory swelling of the conjunctival tissue surrounding
   the cornea. -- {Che*mot"ic}, a.