Definition of "crabgrass" []

• Any of certain grasses of the genus Digitaria, especially D. sanguinalis or D. ischaemum, widely naturalized in North America. (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.

• "Beside the Dumpster in the crabgrass was a pallet stacked with new asphalt shingles."
• "We will not see crabgrass in lawns for several weeks, so any species being called crabgrass right now must be something else."
• "Leading the list of grasses incorrectly identified as crabgrass is tall fescue."