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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 Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


See also botany; plants

a description of grasses. — agrostographer, n.
the branch of systematic botany that studies grasses. Also called graminology.agrostologist, n.
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in classic literature ?
There in the sheltered draw-bottom the wind did not blow very hard, but I could hear it singing its humming tune up on the level, and I could see the tall grasses wave.
Then he went back again into the jungle and in a few minutes reappeared with a quantity of soft grasses and ferns.
Then he spread the ferns and grasses upon the ground in a soft flat bed, and above it leaned many branches together so that they met a few feet over its center.
The girl understood, and taking the long knife she entered and lay down upon the soft grasses while Tarzan of the Apes stretched himself upon the ground across the entrance.
When Jane awoke, she did not at first recall the strange events of the preceding day, and so she wondered at her odd surroundings--the little leafy bower, the soft grasses of her bed, the unfamiliar prospect from the opening at her feet.
A little to one side of the ford in the densest thicket he heard the faint sound of padded feet, and the brushing of a huge body against tall grasses and tangled creepers.
The grasses where Numa lay were very still now--ominously still.
So Tarzan came to his cabin unattended, and a few moments later was curled up in the mildewed remnants of what had once been a bed of grasses. Thus easily did Monsieur Jean C.
As the warrior emerged from the forest, Tarzan caught a fleeting glimpse of a tawny hide worming its way through the matted jungle grasses in his wake--it was Numa, the lion.
She had even placed her precious balu upon the soft grasses and come a little nearer that she might better witness all that was passing in the branches above her.
And Sheeta, the panther, saw that the she-ape had left her cub alone among the grasses. He moved his tail again, as though this closest approximation of lashing in which he dared indulge might stimulate his momentarily waned courage.
There in full sight now was Sheeta, the panther, stalking slowly toward the tiny, wriggling balu which lay among the grasses many yards away.