bluegrass
ˈblü-ˌgras 2 syllables rare
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noun. any of several grasses (genus Poa) of which some have bluish-green culms; especially: kentucky bluegrass
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noun. 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