noun the color of the gem; bright blue.
2. sapphire ·adj of or resembling sapphire; sapphirine; blue.
3. sapphire ·noun any humming bird of the genus hylocharis, native of south america. the throat and breast are usually bright blue.
4. sapphire ·noun native alumina or aluminium sesquioxide, al2o3; corundum; ·esp., the blue transparent variety of corundum, highly prized as a gem.