blue grass

from The Century Dictionary.

• noun In botany, the name of several species of Poa.

from the GNU version of the Collaborative International Dictionary of English.

• (Bot.) A species of grass (Poa compressa) with bluish green stems, valuable in thin gravelly soils; wire grass.
• a species of grass (Poa pratensis) which has running rootstocks and spreads rapidly. It is valuable as a pasture grass, as it endures both winter and drought better than other kinds, and is very nutritious.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Alternative spelling of bluegrass.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of various grasses of the genus Poa
• noun a type of country music played at a rapid tempo on banjos and guitars
• noun an area in central Kentucky noted for it bluegrass and thoroughbred horses
• noun any of various grasses of the genus Poa