n.
Pronunciation: - ˌ gras
Function: noun
Date: 1751
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 played on unamplified stringed instruments (as banjo, fiddle, guitar, and mandolin) and characterized by free improvisation and close usually high-pitched harmony