From The Collaborative International Dictionary of English v.0.48 [gcide]:
Aquamarine \A`qua*ma*rine"\, n. (Min.)
A transparent, pale green variety of beryl, used as a gem.
See {Beryl}.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Beryl \Ber"yl\ (b[e^]r"[i^]l), n. [F. b['e]ryl, OF. beril, L.
beryllus, Gr. bh`ryllos, prob. fr. Skr. vai[dsdot][=u]rya.
Cf. {Brilliant}.] (Min.)
A mineral of great hardness, and, when transparent, of much
beauty. It occurs in hexagonal prisms, commonly of a green or
bluish green color, but also yellow, pink, and white. It is a
silicate of aluminum and beryllium. The {aquamarine} is a
transparent, sea-green variety used as a gem. The {emerald}
is another variety highly prized in jewelry, and
distinguished by its deep color, which is probably due to the
presence of a little oxide of chromium.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
aquamarine
n 1: a transparent variety of beryl that is blue green in color
2: a shade of blue tinged with green [syn: {greenish blue},
{aqua}, {aquamarine}, {turquoise}, {cobalt blue}, {peacock
blue}]
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