|1.||a variety of chalcedony with alternating black and white parallel bands, used as a gemstone. Formula: SiO2|
|2.||a compact variety of calcite used as an ornamental stone; onyx marble. Formula: CaCO3|
|[C13: from Latin from Greek: fingernail (so called from its veined appearance)]|
onyx on·yx (ŏn'ĭks)
A collection of pus in the anterior chamber of the eye.
a hail; claw; hoof, (Heb. shoham), a precious stone adorning the breast-plate of the high priest and the shoulders of the ephod (Ex. 28:9-12, 20; 35:27; Job 28:16; Ezek. 28:13). It was found in the land of Havilah (Gen. 2:12). The LXX. translates the Hebrew word by smaragdos, an emerald. Some think that the sardonyx is meant. But the onyx differs from the sardonyx in this, that while the latter has two layers (black and white) the former has three (black, white, and red).