from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A low-growing, weedy grass (Paspalum distichum) with spikelets arranged in two rows along the rachis.
- n. Any of several weedy plants of the genus Polygonum having stems with nodes.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An annual plant, Polygonum aviculare, found in fields and wasteland
from the GNU version of the Collaborative International Dictionary of English
- n. a common weed with jointed stems (Polygonum aviculare); knotweed.
- n. The dog grass. See under dog.
from The Century Dictionary and Cyclopedia
- n. A weed of almost world-wide distribution, Polygonum aviculare: so called from the numerous nodes in its stems and its thickly spreading habit.
- n. By extension, any plant of the genus Polygonum, properly knotweed.
- n. In occasional use, a plant of some other genus more or less similar.
- n. Couch-grass: a use of doubtful appropriateness.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. low-growing weedy grass with spikelets along the leaf stems
Sorry, no etymologies found.
But the young woman stood, trying to continue chopping the knotgrass.
Soon the sound of those words had grown in the field as thick as knotgrass, as thick as cotton.
Leonoa had survived by a blade-thin chance, and even so, she lay four days in a stupor, waking for an evening before lapsing into bone fever, its delirious contortions permanently thwarting her spine's straightness, lengthening one arm and legs, and throwing the plates of her skull awry, gnarling her like a knotgrass doll.
'Hold it,' said Hagrid abruptly, just as Harry and Hermione were struggling through a patch of thick knotgrass behind him.
They scoff at Hermia, calling her 'dwarf and minimus' and 'hindering knotgrass'.
"There's something else," said Harry, watching Hermione tearing bundles of knotgrass and throwing them into the potion.
"Lacewing flies, leeches, fluxweed, and knotgrass," she murmured, running her finger down the list of ingredients.
The first family (_Polygoneæ_) is represented by the various species of _Polygonum_ (knotgrass, smart-weed, etc.), and among cultivated plants by the buckwheat (_Fagopyrum_).
The hedgehog footed through the knotgrass slowly, grubbing with his snout to right and left of him.
The common knotgrass (Polygonum aviculare) grows most luxuriantly, single plants covering a space 4 or 5 feet in diameter, and sending their roots 3 or 4 feet deep.