Blue grass Bot. A species of grass (Poa compressa) with bluish green stems, valuable in thin gravelly soils; wire grass.
Kentucky blue 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.
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blue grass
n : any of various grasses of the genus Poa [syn: bluegrass]