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bluegrass

[bloo-gras, -grahs]
noun
  1. any 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 especially on the solo banjo.
  3. the Bluegrass. Bluegrass Region.
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Origin of bluegrass

An Americanism dating back to 1745–55; blue + grass
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for bluegrass

bluegrass

noun
  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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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for bluegrass

n.

also blue-grass, music style, 1958, in reference to the Blue Grass Boys, country music band 1940s-'50s, from the "blue" grass (Poa pratensis) characteristic of Kentucky, the grass so called from 1751. Kentucky has been called the Bluegrass State since at least 1872; see blue (n.) + grass.

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Online Etymology Dictionary, © 2010 Douglas Harper

bluegrass in Culture

bluegrass

A kind of folk music for guitar, banjo, violin, other stringed instruments, and voice; bluegrass is distinguished by rapid notes and improvisation by the musicians.

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.