sapphire

n.

  1. Native alumina or aluminium sesquioxide, Al2O3; corundum; esp., the blue transparent variety of corundum, highly prized as a gem.
  2. The color of the gem; bright blue.
  3. Any humming bird of the genus Hylocharis, native of South America. The throat and breast are usually bright blue.

a.

  1. Of or resembling sapphire; sapphirine; blue.