01 n. Native alumina or aluminium sesquioxide, Al2O3; corundum; esp., the blue transparent variety of corundum, highly prized as a gem.
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1.
Native alumina or aluminium sesquioxide, Al2O3; corundum; esp., the blue transparent variety of corundum, highly prized as a gem.(Min.)“Of rubies, sapphires, and of pearlés white.” — Chaucer.
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2.
The color of the gem; bright blue.
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3.
Any humming bird of the genus Hylocharis, native of South America. The throat and breast are usually bright blue.(Zool.)
Phrases & compounds
Star sapphire —
a kind of sapphire which exhibits asterism.