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

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

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Yellowtop \Yel"low*top`\, n. (Bot.) A kind of grass, perhaps a species of Agrostis .

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 ...