Source: The Collaborative International Dictionary of English v.0.48
Glaucoma \Glau*co"ma\, n. [L., fr. Gr. glay`kwma, fr. glayko`s
light gray, blue gray.] (Med.)
Dimness or abolition of sight, with a diminution of
transparency, a bluish or greenish tinge of the refracting
media of the eye, and a hard inelastic condition of the
eyeball, with marked increase of tension within the eyeball.
[1913 Webster]
glaucoma
n : increased pressure in the eyeball due to obstruction of the
outflow of aqueous humor; damages the optic disc and
impairs vision (sometimes progressing to blindness)