UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈbluːˌɡrɑːs/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈbluˌgræs/ ,USA pronunciation: respelling(blo̅o̅gras′, -gräs′)

WordReference Random House Learner's Dictionary of American English © 2020
blue•grass /ˈbluˌgræs/USA pronunciation   n. [uncountable]
  1. Plant Biologya grass having dense clumps of bluish green blades.
  2. Music and Dancea kind of country music played on the banjo, fiddle, guitar, and bass.

WordReference Random House Unabridged Dictionary of American English © 2020
blue•grass  (blo̅o̅gras′, -gräs′),USA pronunciation n. 
  1. Plant Biologyany grass of the genus Poa, as the Kentucky bluegrass, P. pratensis, having dense tufts of bluish-green blades and creeping rhizomes.
  2. country music that is polyphonic in character and is played on unamplified stringed instruments, with emphasis esp. on the solo banjo.
  3. Place Namesthe Bluegrass. See  Bluegrass Region. 
  • blue + grass 1745–55, American.

Collins Concise English Dictionary © HarperCollins Publishers::
bluegrass /ˈbluːˌɡrɑːs/ n
  1. any of several North American bluish-green grasses of the genus Poa, esp P. pratensis (Kentucky bluegrass), grown for forage
  2. a type of folk music originating in Kentucky, characterized by a simple harmonized accompaniment
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