Definitions for crab grass
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Random House Webster's College Dictionary
crab′ grass`(n.)
a weed grass, Digitaria sanguinales, that roots vigorously from the lower stem joints and grows in thick patches on lawns and uncultivated areas.
Category: Plants
Origin of crab grass:
1590–1600
Princeton's WordNet
crabgrass, crab grass, finger grass(noun)
grasses with creeping stems that root freely; a pest in lawns
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"crab grass." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/crab grass>.