"bluebonnets" in the noun sense
1. bluebonnet, buffalo clover, Texas bluebonnet, Lupinus subcarnosus
low-growing annual herb of southwestern United States (Texas) having silky foliage and blue flowers a leading cause of livestock poisoning in the southwestern United States
2. Balmoral, bluebonnet
a brimless dark blue Scottish cap with a flat top and a plume on one side
Source: WordNet® (An amazing lexical database of English)
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