Annual or perennial grasses cosmopolitan in northern hemisphere bent grass (so named from `bent' meaning an area of unfenced grassland)

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Agrostis \A*gros"tis\, n. [L., fr. Gr. ?.] A genus of grasses, including species called in common language bent grass. Some of them, as redtop ( Agrostis vulgaris ), are valuable pasture grasses.

Wikipedia Word definitions in Wikipedia
Agrostis ( bent or bentgrass ) is a large and very nearly cosmopolitan genus of plants in the grass family , found in nearly all the countries in the world. It has been bred as a GMO creeping bent grass. Species formerly included hundreds of species now ...

Wiktionary Word definitions in Wiktionary
n. Any grass of the genus (term Agrostis Translingual), bentgrass.