n.1. a. A member of the grass family.
b. The members of the grass family considered as a group.
2. Any of various plants having slender leaves similar to those of a grass.
3. Ground, as on a lawn, that is covered with grass or similar plants.
4. Grazing land; pasture.
5. Slang Marijuana.
6. Electronics Small variations in amplitude of an oscilloscope display caused by electrical noise.
7. Chiefly British Slang An informer.