Blue bonnet \Blue" bon`net\ or Blue-bonnet \Blue"-bon`net\, n.

1. A broad, flat Scottish cap of blue woolen, or one wearing such cap; a Scotchman.

2. (Bot.) A plant. Same as Bluebottle.

3. (Zo["o]l.) The European blue titmouse (Parus c[oe]ruleus); the bluecap.

Source: Webster's Revised Unabridged Dictionary (1913)