Definition of grass
1
: herbage suitable or used for grazing animals
2
: any of a large family (Gramineae synonym Poaceae) of monocotyledonous mostly herbaceous plants with jointed stems, slender sheathing leaves, and flowers borne in spikelets of bracts
3
: land (such as a lawn or a turf racetrack) covered with growing grass
- keep off the grass
- the horse had never won on grass
4
grasses plural
: leaves or plants of grass
5
: a state or place of retirement
- put out to grass
6
[short for grasshopper, rhyming slang for copper]
slang, British
: a police informer
7
: electronic noise on a radarscope that takes the form of vertical lines resembling lawn grass
8
: marijuana
