Definition of bluebonnet
1a
: a wide flat round cap of blue wool formerly worn in Scotland
2
: either of two low-growing annual lupines (Lupinus subcarnosus or L. texensis) of Texas with silky foliage and blue flowers
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Merriam-Webster unabridged
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Time Traveler for bluebonnet
The first known use of bluebonnet was in 1568
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