grass

Other Definitions
grass (dict)

In popular language grass means a short, green, ground covering or lawn, usually, but not necessarily comprised of a "true grass" or grasses, called turf. See also pasture, grass (material).
In botany, grass refers to plants of the family Poaceae. These are the true grasses.
Plants that are not true grasses include:

China grass or remie or rhea (Boehmeria nivea), a nettle grown for bast fibres, in the family Urticaceae
Ditch grass or Wigeon grass (Ruppia maritima) in the family Ruppiaceae
Fish grass (Cabomba caroliniana)
Goosegrass (Galium aparine)
Mondo grass or lily turf (Ophiopogon japonicus), an Asian ornamental ground cover
Nutgrass, a common lawn pest (Cyperus rotundus) in the family Cyperaceae
Pepper grasses (Lipidium spp.) in the family Brassicaceae
Sawgrass, abundant in sub-tropical marshlands (Cladium spp.) in the family Cyperaceae
Scurvy-grass (Cochlearia species) in the family Brassicaceae
Scurvy-grass Sorrel (Oxalis enneaphylla) in the family Oxalidaceae
Seagrasses, including Eel grass (Zostera spp.)
"Sleeping grass" (Mimosa pudica) a legume (family Fabaceae) and lawn pest
Xyridaceae, known as the yellow-eyed grass family

Grass is slang for marijuana or for a criminal who informs on his accomplices.
GRASS for "GRAphics Symbiosis System" is a computer programming language
GRASS GIS (Geographic Resources Analysis Support System) is an Open source geographic information system.

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