/terr"koyz, -kwoyz/ , n.
1. Also, turquois . an opaque mineral, a basic hydrous copper aluminum phosphate often containing a small amount of iron, sky-blue or greenish-blue in color, cut cabochon as a gem. Cf. bone turquoise .
2. Also called turquoise blue . a greenish blue or bluish green.
[ 1350-1400; Turc TURK + -oise, fem. of -ois -ESE; r. ME turkeis ]