"bluegrasses" in the noun sense
1. bluegrass, blue grass
any of various grasses of the genus Poa
2. Bluegrass, Bluegrass Country, Bluegrass Region
an area in central Kentucky noted for its bluegrass and thoroughbred horses
3. bluegrass
a type of country music played at a rapid tempo on banjos and guitars
Source: WordNet® (An amazing lexical database of English)
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