Definition of bluegrass
1
: any of several grasses (genus Poa) of which some have bluish-green culms
especially
: kentucky bluegrass
2
[from the Blue Grass Boys, performing group, from Bluegrass state, nickname of Kentucky]
: country music characterized by the use of unamplified stringed instruments (such as banjo, fiddle, guitar, and mandolin), by free improvisation, and by close usually high-pitched harmony
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Merriam-Webster unabridged
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Time Traveler for bluegrass
The first known use of bluegrass was in 1751
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