COLLYRIUM, in pharmacy, a topical remedy for a disorder of the eyes; designed to cool and repel hot, sharp humours.
They are generally of two kinds, the one liquid, and the other dry: liquid collyrias are composed of ophthalmic powders in waters, as rose-water, plantain-water, or that of fennel, eye-bright, &c. wherein in tummy, white vitriol, or some other proper powder, is dissolved.
The dry collyrium is troches of rhasis, sugar-candy, tummy prepared, &c. blown into the eye.