1. (n.) Native alumina or aluminium sesquioxide, Al2O3; corundum; esp., the blue transparent variety of corundum, highly prized as a gem.

2. (n.) The color of the gem; bright blue.

3. (n.) Any humming bird of the genus Hylocharis, native of South America. The throat and breast are usually bright blue.

4. (a.) of or resembling sapphire; sapphirine; blue.

adamant agate alexandrite amethyst aquamarine azure azure-blue azure-colored azurean azured azureous beryl beryl-blue berylline bloodstone blue bluish brilliant carbuncle carnelian cerulean ceruleous cerulescent chalcedony chrysoberyl chrysolite citrine coral cyanean dark-blue deep-blue demantoid diamond emerald garnet girasol harlequin opal heliotrope hyacinth jade jadestone jargoon jasper lapis lazuli light-blue lightish-blue livid moonstone morganite onyx opal pavonian pavonine peacock-blue peridot plasma rose quartz ruby sapphirine sard sardonyx sky-blue sky-colored sky-dyed spinel spinel ruby topaz turquoise