1. Noun
Native alumina or aluminium sesquioxide, Al2O3; corundum; esp., the blue transparent variety of corundum, highly prized as a gem.
2. Noun
The color of the gem; bright blue.
3. Noun
Any humming bird of the genus Hylocharis, native of South America. The throat and breast are usually bright blue.
4. Adjective
Of or resembling sapphire; sapphirine; blue.
5. Noun
a precious transparent stone of rich blue corundum valued as a gemstone
Vocabulary classified under Chemistry
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