ONYX

(Lat.), n. m. On(o2n)'i2x(u8x). Gen., on'ychos (-is). Gr., owf. 1. See NAIL (1st def.). 2. A disease of the nail, usually non ulcerative. [G. 71.] 3. A name applied to what was formerly regarded as a nail-shaped collection of pus between the layers of the cornea, but which is now known to be simply a form of hypopyon. [L, 50 (o, 14).] 4. A variety of quartz disposed in layers of different colors; a kind of it was formerly used in corneal ulceration, and, internally, as an astringent. [B, 88 (a. 50).] [s. 142]