| agueweed | (noun) gentian of eastern North America having clusters of bristly blue flowers | Synonyms: ague weed, five-flowered gentian, Gentiana quinquefolia, Gentianella quinquefolia, stiff gentian |
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| (noun) perennial herb of southeastern United States having white-rayed flower heads; formerly used as in folk medicine | Synonyms: boneset, Eupatorium perfoliatum, thoroughwort |
| beetleweed | (noun) tufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall | Synonyms: coltsfoot, galax, Galax urceolata, galaxy, wandflower |
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| beggarweed | (noun) West Indian forage plant cultivated in southern United States as forage and to improve soil | Synonyms: Desmodium purpureum, Desmodium tortuosum |
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| benweed | (noun) widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity | Synonyms: ragweed, ragwort, Senecio jacobaea, tansy ragwort |
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| bindweed | (noun) any of several vines of the genera Convolvulus and Calystegia having a twining habit | - |
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| bitterweed | (noun) any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma | Synonyms: ambrosia, ragweed |
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| (noun) widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States | Synonyms: bristly oxtongue, bugloss, oxtongue, Picris echioides |
| blueweed | (noun) a coarse prickly European weed with spikes of blue flowers; naturalized in United States | Synonyms: blue devil, blue thistle, Echium vulgare, viper's bugloss |
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| brookweed | (noun) water pimpernel of Europe to China | Synonyms: Samolus valerandii |
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| (noun) American water pimpernel | Synonyms: Samolus floribundus, Samolus parviflorus |
| broomweed | (noun) annual of southwestern United States having rigid woody branches with sticky foliage and yellow flowers | Synonyms: broom-weed, Gutierrezia texana |
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| bugleweed | (noun) any of various low-growing annual or perennial evergreen herbs native to Eurasia; used for ground cover | Synonyms: bugle |
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| (noun) a mildly narcotic and astringent aromatic herb having small whitish flowers; eastern United States | Synonyms: Lycopus virginicus |
| butterweed | (noun) any of several yellow-flowered plants of the genus Packera; often placed in genus Senecio | - |
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| (noun) American ragwort with yellow flowers | Synonyms: ragwort, Senecio glabellus |
| camphorweed | (noun) aromatic plant of western United States | Synonyms: Trichostema lanceolatum, turpentine camphor weed, vinegarweed |
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| cancerweed | (noun) sage of eastern United States | Synonyms: cancer weed, Salvia lyrata |
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| candyweed | (noun) bog plant of pine barrens of southeastern United States having spikes of irregular yellow-orange flowers | Synonyms: orange milkwort, Polygala lutea, yellow bachelor's button, yellow milkwort |
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| cankerweed | (noun) herb of northeastern North America having drooping clusters of yellowish-white flowers; sometimes placed in genus Prenanthes | Synonyms: Nabalus alba, Prenanthes alba, white lettuce |
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| capeweed | (noun) European weed widely naturalized in North America having yellow flower heads and leaves resembling a cat's ears | Synonyms: California dandelion, cat's-ear, gosmore, Hypochaeris radicata |
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| carpetweed | (noun) annual prostrate mat-forming weed having whorled leaves and small greenish-white flowers; widespread throughout North America | Synonyms: Indian chickweed, Molluga verticillata |
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| catchweed | (noun) annual having the stem beset with curved prickles; North America and Europe and Asia | Synonyms: cleavers, clivers, Galium aparine, goose grass, spring cleavers |
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| chafeweed | (noun) weedy perennial of north temperate regions having woolly foliage and dirty white flowers in a leafy spike | Synonyms: Gnaphalium sylvaticum, wood cudweed |
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| chaffweed | (noun) weedy plant having short dry chafflike leaves | Synonyms: bastard pimpernel, false pimpernel |
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| chickweed | (noun) any of various plants of the genus Stellaria | - |
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| (noun) any of various plants related to the common chickweed | Synonyms: clammy chickweed, mouse-ear chickweed, mouse ear, mouse eared chickweed |
| clammyweed | (noun) strong-scented herb common in southern United States covered with intermixed gland and hairs | Synonyms: Polanisia dodecandra, Polanisia graveolens |
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| clearweed | (noun) a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves | Synonyms: dead nettle, Pilea pumilla, richweed |
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| cottonweed | (noun) any of various plants of the genus Froelichia found in sandy soils and on rocky slopes in warmer regions of America; grown for their spikes of woolly white flowers | - |
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| (noun) an American everlasting having foliage with soft wooly hairs and corymbose heads with pearly white bracts | Synonyms: Anaphalis margaritacea, pearly everlasting |
| crazyweed | (noun) any of several leguminous plants of western North America causing locoism in livestock | Synonyms: crazy weed, locoweed |
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| cudweed | (noun) any of numerous plants of the genus Gnaphalium having flowers that can be dried without loss of form or color | - |
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| (noun) any plant of the genus Filago having capitate clusters of small woolly flower heads | Synonyms: cotton rose, filago |
| (noun) perennial cottony-white herb of southwestern United States | Synonyms: Artemisia gnaphalodes, Artemisia ludoviciana, prairie sage, western mugwort, white sage |
| duckweed | (noun) any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds | - |
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| dyeweed | (noun) small Eurasian shrub having clusters of yellow flowers that yield a dye; common as a weed in Britain and the United States; sometimes grown as an ornamental | Synonyms: dyer's-broom, dyer's greenweed, Genista tinctoria, greenweed, whin, woadwaxen, woodwaxen |
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| fanweed | (noun) foetid Eurasian weed having round flat pods; naturalized throughout North America | Synonyms: field pennycress, French weed, mithridate mustard, penny grass, stinkweed, Thlaspi arvense |
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| fireweed | (noun) tall North American perennial with creeping rootstocks and narrow leaves and spikes of pinkish-purple flowers occurring in great abundance in burned-over areas or recent clearings; an important honey plant | Synonyms: Epilobium angustifolium, giant willowherb, rosebay willowherb, wickup |
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| (noun) an American weedy plant with small white or greenish flowers | Synonyms: Erechtites hieracifolia |
| frostweed | (noun) perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts | Synonyms: Crocanthemum canadense, frost-weed, frostwort, Helianthemum canadense |
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| (noun) tall perennial herb having clusters of white flowers; the eastern United States | Synonyms: frost-weed, Verbesina virginica, Virginia crownbeard |
| gravelweed | (noun) perennial herb with yellow flowers; southern and south central United States | Synonyms: Verbesina helianthoides |
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| greenweed | (noun) small Eurasian shrub having clusters of yellow flowers that yield a dye; common as a weed in Britain and the United States; sometimes grown as an ornamental | Synonyms: dyer's-broom, dyer's greenweed, dyeweed, Genista tinctoria, whin, woadwaxen, woodwaxen |
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| gulfweed | (noun) brown algae with rounded bladders forming dense floating masses in tropical Atlantic waters as in the Sargasso Sea | Synonyms: sargasso, sargassum, Sargassum bacciferum |
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| gumweed | (noun) any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock | Synonyms: gum plant, rosinweed, tarweed |
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| gypsyweed | (noun) common hairy European perennial with pale blue or lilac flowers in axillary racemes | Synonyms: common speedwell, Veronica officinalis |
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| hawkweed | (noun) any of numerous often hairy plants of the genus Hieracium having yellow or orange flowers that resemble the dandelion | - |
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| (noun) any of various plants of the genus Pilosella | - |
| hogweed | (noun) tall coarse plant having thick stems and cluster of white to purple flowers | Synonyms: cow parsnip, Heracleum sphondylium |
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| horseweed | (noun) common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron | Synonyms: Canadian fleabane, Conyza canadensis, Erigeron canadensis, fleabane |
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| (noun) erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States | Synonyms: Collinsonia canadensis, horse balm, richweed, stone-root, stone root, stoneroot |
| ironweed | (noun) any of various plants of the genus Vernonia of tropical and warm regions of especially North America that take their name from their loose heads of purple to rose flowers that quickly take on a rusty hue | Synonyms: vernonia |
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| jewelweed | (noun) North American annual plant with usually yellow or orange flowers; grows chiefly on wet rather acid soil | Synonyms: celandine, Impatiens capensis, lady's earrings, orange balsam, touch-me-not |
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| jimsonweed | (noun) intensely poisonous tall coarse annual tropical weed having rank-smelling foliage, large white or violet trumpet-shaped flowers and prickly fruits | Synonyms: apple of Peru, common thorn apple, Datura stramonium, Jamestown weed, jimson weed |
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| knapweed | (noun) any of various plants of the genus Centaurea having purple thistlelike flowers | - |
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| locoweed | (noun) street names for marijuana | Synonyms: dope, gage, grass, green goddess, Mary Jane, pot, sens, sess, skunk, smoke, weed |
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| (noun) any of several leguminous plants of western North America causing locoism in livestock | Synonyms: crazy weed, crazyweed |
| markweed | (noun) climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact | Synonyms: poison ivy, poison mercury, poison oak, Rhus radicans, Toxicodendron radicans |
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| matchweed | (noun) any of several plants of the genus Gutierrezia having tiny flower heads that resemble the heads of matches | Synonyms: matchbush |
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| mayweed | (noun) widespread rank-smelling weed having white-rayed flower heads with yellow discs | Synonyms: Anthemis cotula, dog fennel, stinking chamomile, stinking mayweed |
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| milkweed | (noun) any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts | Synonyms: silkweed |
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| (noun) annual Eurasian sow thistle with soft spiny leaves and rayed yellow flower heads | Synonyms: Sonchus oleraceus |
| nitweed | (noun) annual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowers | Synonyms: Hypericum gentianoides, orange grass, pine-weed, pineweed |
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| pearlweed | (noun) any of various low-growing plants of the genus Sagina having small spherical flowers resembling pearls | Synonyms: pearl-weed, pearlwort |
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| pickerelweed | (noun) American plant having spikes of blue flowers and growing in shallow water of streams and ponds | Synonyms: pickerel weed, Pontederia cordata, wampee |
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| pigweed | (noun) leaves collected from the wild | Synonyms: lamb's-quarter, wild spinach |
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| (noun) common weedy European plant introduced into North America; often used as a potherb | Synonyms: Chenopodium album, lamb's-quarters, wild spinach |
| (noun) leaves sometimes used as potherbs; seeds used as cereal; southern United States to Central America; India and China | Synonyms: Amaranthus hypochondriacus |
| pineweed | (noun) annual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowers | Synonyms: Hypericum gentianoides, nitweed, orange grass, pine-weed |
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| pokeweed | (noun) perennial of the genus Phytolacca | - |
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| pondweed | (noun) any of several submerged or floating freshwater perennial aquatic weeds belonging to the family Potamogetonaceae | - |
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| (noun) submerged freshwater perennials | Synonyms: ditchmoss, Elodea, genus Elodea |
| rabbitweed | (noun) low-growing sticky subshrub of southwestern United States having narrow linear leaves on many slender branches and hundreds of tiny yellow flower heads | Synonyms: broom snakeroot, broom snakeweed, Gutierrezia sarothrae, rabbit-weed, snakeweed, turpentine weed |
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| ragweed | (noun) any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma | Synonyms: ambrosia, bitterweed |
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| (noun) widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity | Synonyms: benweed, ragwort, Senecio jacobaea, tansy ragwort |
| richweed | (noun) a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves | Synonyms: clearweed, dead nettle, Pilea pumilla |
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| (noun) erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States | Synonyms: Collinsonia canadensis, horse balm, horseweed, stone-root, stone root, stoneroot |
| rockweed | (noun) coarse brown seaweed growing on rocks exposed at low tide | - |
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| rosinweed | (noun) North American perennial having a resinous odor and yellow flowers | Synonyms: Silphium laciniatum |
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| (noun) any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock | Synonyms: gum plant, gumweed, tarweed |
| scorpionweed | (noun) any plant of the genus Phacelia | Synonyms: phacelia, scorpion weed |
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| seaweed | (noun) plant growing in the sea, especially marine algae | - |
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| silkweed | (noun) any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts | Synonyms: milkweed |
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| silverweed | (noun) any of various twining shrubs of the genus Argyreia having silvery leaves and showy purple flowers | - |
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| (noun) low-growing perennial having leaves silvery beneath; northern United States, Europe, Asia | Synonyms: goose-tansy, goose grass, Potentilla anserina |
| skunkweed | (noun) tall herb of the Rocky Mountains having sticky leaves and an offensive smell | Synonyms: Polemonium viscosum, skunk-weed |
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| snakeweed | (noun) low-growing sticky subshrub of southwestern United States having narrow linear leaves on many slender branches and hundreds of tiny yellow flower heads | Synonyms: broom snakeroot, broom snakeweed, Gutierrezia sarothrae, rabbit-weed, rabbitweed, turpentine weed |
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| sneezeweed | (noun) any of various plants of the genus Helenium characteristically causing sneezing | - |
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| soapweed | (noun) tall arborescent yucca of southwestern United States | Synonyms: soap-weed, soap tree, Yucca elata |
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| stickweed | (noun) any of several herbaceous plants having seeds that cling to clothing | - |
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| stinkweed | (noun) foetid Eurasian weed having round flat pods; naturalized throughout North America | Synonyms: fanweed, field pennycress, French weed, mithridate mustard, penny grass, Thlaspi arvense |
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| tarweed | (noun) any of various resinous glandular plants of the genus Madia; of western North and South America | - |
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| (noun) any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock | Synonyms: gum plant, gumweed, rosinweed |
| thimbleweed | (noun) a common North American anemone with cylindrical fruit clusters resembling thimbles | Synonyms: Anemone cylindrica |
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| tickweed | (noun) any of numerous plants of the genus Coreopsis having a profusion of showy usually yellow daisylike flowers over long periods; North and South America | Synonyms: coreopsis, tick-weed, tickseed |
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| tumbleweed | (noun) any plant that breaks away from its roots in autumn and is driven by the wind as a light rolling mass | - |
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| (noun) bushy annual weed of central North America having greenish flowers and winged seeds | Synonyms: Cycloloma atriplicifolium, winged pigweed |
| (noun) bushy plant of western United States | Synonyms: Amaranthus albus, Amaranthus graecizans |
| (noun) prickly bushy Eurasian plant; a troublesome weed in central and western United States | Synonyms: Russian cactus, Russian thistle, Russian tumbleweed, Salsola kali tenuifolia |
| tweed | (noun) thick woolen fabric used for clothing; originated in Scotland | - |
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| (noun) (usually in the plural) trousers made of flannel or gabardine or tweed or white cloth | Synonyms: flannel, gabardine, white |
| velvetweed | (noun) tall annual herb or subshrub of tropical Asia having velvety leaves and yellow flowers and yielding a strong fiber; naturalized in southeastern Europe and United States | Synonyms: Abutilon theophrasti, butter-print, China jute, Indian mallow, velvet-leaf, velvetleaf |
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| vinegarweed | (noun) aromatic plant of western United States | Synonyms: camphorweed, Trichostema lanceolatum, turpentine camphor weed |
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| wartweed | (noun) not unattractive European weed whose flowers turn toward the sun | Synonyms: devil's milk, Euphorbia helioscopia, sun spurge, wartwort |
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| waterweed | (noun) a weedy aquatic plant of genus Elodea | - |
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| weed | (noun) street names for marijuana | Synonyms: dope, gage, grass, green goddess, locoweed, Mary Jane, pot, sens, sess, skunk, smoke |
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| (noun) a black band worn by a man (on the arm or hat) as a sign of mourning | Synonyms: mourning band |
| (noun) any plant that crowds out cultivated plants | - |
| (verb) clear of weeds | - |