Blue-bonnet Definition

A traditional flat Scottish hat made of blue wool; a blue tam-o'-shanter. [from 16th c.]

Someone who wears such a hat; a Scotsman, especially a Scottish soldier. [from 17th c.]

Any of several blue flowering plants, especially cornflower, Centaurea cyanus, and plants of the genus Scabiosa. [from 18th c.]

A blue Australian parrot, especially Northiella haematogaster. [from 19th c.]

(US, regional) Any of several North American species of Lupinus common in the southwestern US, especially Lupinus texensis and Lupinus subcarnosus. [from 20th c.]