Kentucky bluegrass

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A perennial rhizomatous grass (Poa pratensis) native to Eurasia and North Africa and widely cultivated in the United States as a lawn and pasture grass.

from The Century Dictionary.

• noun See blue-grass.

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

• noun valuable meadow and pasture grass in Europe and especially central United States having tall stalks and slender bright green leaves; a chief constituent in lawn grass mixtures