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.
v. grassed, grass·ing, grass·es
a. To cover with grass.
b. To grow grass on.
2. To feed (livestock) with grass.
1. To become covered with grass.
2. To graze.
[Middle English gras, from Old English græs; see ghrē- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.