Source : Webster's Revised Unabridged Dictionary (1913)

Collyrium \Col*lyr"i*um\, n.; pl. E. {Collyriums}, L.
   {Collyria}. [L., fr. Gr. ?.] (Med.)
   An application to the eye, usually an eyewater.

Source : WordNet®

collyrium
     n : lotion consisting of a solution used as a cleanser for the
         eyes [syn: {eye-lotion}, {eyewash}]
     [also: {collyria} (pl)]