- bluegrass, blue grass - any of various grasses of the genus Poa
--1 is a kind of grass
--1 is a member of Poa, genus Poa
--1 has particulars:Kentucky bluegrass, Kentucky blue, Kentucy blue grass, June grass, Poa pratensis - Bluegrass, Bluegrass Country, Bluegrass Region - an area in central Kentucky notied for it bluegrass and thoroughbred horses
--2 is a kind of geographical area, geographic area, geographical region, geographic region
- bluegrass - a type of country music played at a rapid tempo on banjos and guitars
--3 is a kind of country music, country and western, C and W