Definitions of canary:

• noun:   any of several small Old World finches
• noun:   a female singer
• noun:   a moderate yellow with a greenish tinge
• noun:   someone acting as an informer or decoy for the police
• adjective:   having the color of a canary; a light to moderate yellow
• name:  A surname (very rare: popularity rank in the U.S.: #21688)