From The Collaborative International Dictionary of English v.0.48 [gcide]:
Turquoise \Tur*quoise"\, Turquois \Tur*quois"\ (?; 277), n. [F.
turquoise; cf. Pr. & Sp. turquesa, It. turchese, turchina,
LL. turchesius, turchina; -- so called because first brought
from Turkey. See 1st {Turkey}.] (Min.)
A hydrous phosphate of alumina containing a little copper;
calaite. It has a blue, or bluish green, color, and usually
occurs in reniform masses with a botryoidal surface.
[Formerly written also {turcois}, and {turkois}.]
[1913 Webster]
Note: Turquoise is susceptible of a high polish, and when of
a bright blue color is much esteemed as a gem. The
finest specimens come from Persia. It is also found in
New Mexico and Arizona, and is regarded as identical
with the chalchihuitl of the Mexicans.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Turquoise \Tur*quoise"\, a.
Having a fine light blue color, like that of choice mineral
turquoise.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
turquoise
n 1: a blue to grey green mineral consisting of copper aluminum
phosphate; "blue turquoise is valued as a gemstone"
2: a shade of blue tinged with green [syn: {greenish blue},
{aqua}, {aquamarine}, {turquoise}, {cobalt blue}, {peacock
blue}]
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