- blue|grass «BLOO GRAS, -GRAHS», noun.1. a grass with bluish-green stems, especially Kentucky bluegrass. Bluegrass is valuable for pasturage, hay, and lawns.2. U.S. a style of country music that originated in rural areas of the South, characterized by simplicity and folksiness and the use of string instruments, especially the banjo.
Useful english dictionary. 2012.