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1. Any of various grasses of the genus Poa, having bluish spikelets, including species such as Kentucky bluegrass that are used for pastures and lawns and others that are considered weeds.
2. Music A type of country music that originated in the southern United States, typically played on acoustic stringed instruments and characterized by rapid tempos and jazzlike improvisation.
Blue·grassalso Blue·grass Country or Blue·grass Region (blo͞o′grăs′)
A region of central Kentucky noted for its lushly growing bluegrass and the breeding of thoroughbred horses.