Definition of "ryegrass" [ryegrass]

• See darnel. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The local grass in Fort Myers is a very stiff broad-bladed variety, but we plant our test fields with annual ryegrass, which is more like the grass most mowers deal with throughout the rest of the country."
• "One of the problems with forage crops such as ryegrass and clover is that they have too much lignin, which can cause ruminants like cows to get sick."
• "The exact projects TGAC will start work on will be determined by an independent Scientific Advisory Board, but future projects could include economically important organisms such as ryegrass for sustainable bioenergy production, the tomato to understand its anti-cancer properties and the sheep to help farmers develop disease resistant breeds."