ONYX
onyx
(noun) a chalcedony with alternating black and white bands; used in making cameos
Source: WordNet® 3.1
Etymology
Noun
onyx (countable and uncountable, plural onyxes)
(mineral) A banded variety of chalcedony, a cryptocrystalline form of quartz.
A jet-black color, named after the gemstone.
Any of various lycaenid butterflies of the genus Horaga.
Adjective
onyx (not comparable)
jet-black
Proper noun
Onyx
A census-designated place in Kern County, California, United States.
Source: Wiktionary
O"nyx, n. Etym: [L., fr. Gr. Nail, and cf. Onycha.] (Min.)
Definition: Chalcedony in parallel layers of different shades of color. It
is used for making cameos, the figure being cut in one layer with the
next as a ground. Onyx marble, a banded variety of marble or calcium
carbonate resembling onyx. It is obtained from Mexico.
Source: Webster’s Unabridged Dictionary 1913 Edition