GNU Collaborative International Dictionary of English

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1.       
   Blue grass . (Bot.) A species of grass (Poa compressa) with bluish green stems, valuable in thin gravelly soils; wire grass.
   1913 Webster
   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.
   1913 Webster