weed

/wid/

/wid/

Other forms: weeds; weeding; weeded

Definitions of weed

1. noun

   any plant that crowds out cultivated plants
   antonyms:

   cultivated plant

   plants that are grown for their produce

   types:

   Agrostemma githago, corn campion, corn cockle, crown-of-the-field

   European annual having large trumpet-shaped reddish-purple flowers and poisonous seed; a common weed in grainfields and beside roadways; naturalized in America

   Scleranthus annuus, knawe, knawel

   widely distributed low-growing Eurasian herb having narrow leaves and inconspicuous green flowers

   Spergula arvensis, corn spurrey, corn spurry

   small European weed with whorled leaves and white flowers

   Spergularia rubra, sand spurry, sea spurry

   prostrate weedy herb with tiny pink flowers; widespread throughout Europe and Asia on sand dunes and heath and coastal cliffs; naturalized in eastern North America

   Indian chickweed, Molluga verticillata, carpetweed

   annual prostrate mat-forming weed having whorled leaves and small greenish-white flowers; widespread throughout North America

   Alternanthera philoxeroides, alligator grass, alligator weed

   prolific South American aquatic weed having grasslike leaves and short spikes of white flowers; clogs waterways with dense floating masses

   Barbarea vulgaris, Sisymbrium barbarea, rockcress, rocket cress, yellow rocket

   noxious cress with yellow flowers; sometimes placed in genus Sisymbrium

   Erysimum cheiranthoides, wormseed mustard

   slender yellow-flowered European mustard often troublesome as a weed; formerly used as an anthelmintic

   Raphanus raphanistrum, jointed charlock, runch, wild radish, wild rape

   Eurasian weed having yellow or mauve or white flowers and podlike fruits

   pennycress

   any of several plants of the genus Thlaspi

   ambrosia, bitterweed, ragweed

   any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma

   thistle

   any of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leaves

   Barnaby's thistle, Centaurea solstitialis, yellow star-thistle

   European weed having a winged stem and hairy leaves; adventive in the eastern United States

   Canadian fleabane, Conyza canadensis, Erigeron canadensis, fleabane, horseweed

   common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron

   Erechtites hieracifolia, fireweed

   an American weedy plant with small white or greenish flowers

   Hieracium praealtum, king devil, yellow hawkweed

   European hawkweed introduced into northeastern United States; locally troublesome weeds

   California dandelion, Hypochaeris radicata, capeweed, cat's-ear, gosmore

   European weed widely naturalized in North America having yellow flower heads and leaves resembling a cat's ears

   Parthenium hysterophorus, bastard feverfew

   tropical American annual weed with small radiate heads of white flowers; adventive in southern United States

   Picris echioides, bitterweed, bristly oxtongue, bugloss, oxtongue

   widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States

   Hieracium aurantiacum, Pilosella aurantiaca, orange hawkweed

   European hawkweed having flower heads with bright orange-red rays; a troublesome weed especially as naturalized in northeastern North America; sometimes placed in genus Hieracium

   Senecio doublasii, threadleaf groundsel

   bluish-green bushy leafy plant covered with close white wool and bearing branched clusters of yellow flower heads; southwestern United States; toxic to range livestock

   Senecio jacobaea, benweed, ragweed, ragwort, tansy ragwort

   widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity

   Senecio vulgaris, groundsel

   Eurasian weed with heads of small yellow flowers

   cockle-bur, cockle-burr, cocklebur, cockleburr

   any coarse weed of the genus Xanthium having spiny burrs

   nettle

   any of numerous plants having stinging hairs that cause skin irritation on contact (especially of the genus Urtica or family Urticaceae)

   tumbleweed

   any plant that breaks away from its roots in autumn and is driven by the wind as a light rolling mass

   madnep, wild parsnip

   biennial weed in Europe and America having large pinnate leaves and yellow flowers and a bitter and somewhat poisonous root; the ancestor of cultivated parsnip

   French weed, Thlaspi arvense, fanweed, field pennycress, mithridate mustard, penny grass, stinkweed

   foetid Eurasian weed having round flat pods; naturalized throughout North America

   Ambrosia artemisiifolia, common ragweed

   annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally

   Ambrosia trifida, great ragweed

   a coarse annual with some leaves deeply and palmately three-cleft or five-cleft

   Ambrosia psilostachya, perennial ragweed, western ragweed

   coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico

   Carduus crispus, welted thistle

   European biennial introduced in North America having flower heads in crowded clusters at ends of branches

   Carduus nutans, musk thistle, nodding thistle

   Eurasian perennial naturalized in eastern North America having very spiny white cottony foliage and nodding musky crimson flower heads; valuable source of nectar

   carline thistle

   a thistle of the genus Carlina

   plume thistle, plumed thistle

   any of numerous biennial to perennial herbs with handsome purple or yellow or occasionally white flower heads

   Cirsium discolor, field thistle

   stout North American thistle with purplish-pink flower heads

   Cirsium helenioides, Cirsium heterophylum, melancholy thistle

   perennial stoloniferous thistle of northern Europe with lanceolate basal leaves and usually solitary heads of reddish-purple flowers

   Cnicus benedictus, blessed thistle, sweet sultan

   annual of Mediterranean to Portugal having hairy stems and minutely spiny-toothed leaves and large heads of yellow flowers

   Onopordon acanthium, Onopordum acanthium, Scotch thistle, cotton thistle, woolly thistle

   biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America

   golden thistle

   any of several spiny Mediterranean herbs of the genus Scolymus having yellow flower heads

   Urtica dioica, stinging nettle

   perennial Eurasian nettle established in North America having broad coarsely toothed leaves with copious stinging hairs

   Roman nettle, Urtica pipulifera

   annual European nettle with stinging foliage and small clusters of green flowers

   Laportea canadensis, wood nettle

   American perennial herb found in rich woods and provided with stinging hairs; provides fibers used for textiles

   Pilea pumilla, clearweed, dead nettle, richweed

   a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves

   Pilea microphylla, artillery plant

   tropical American stingless nettle that discharges its pollen explosively

   Pilea involucrata, friendship plant, panamica, panamiga

   low stingless nettle of Central and South America having velvety brownish-green toothed leaves and clusters of small green flowers

   type of:

   tracheophyte, vascular plant

   green plant having a vascular system: ferns, gymnosperms, angiosperms
2. noun

   street names for marijuana
   type of:

   cannabis, ganja, marihuana, marijuana

   the most commonly used illicit drug; considered a soft drug, it consists of the dried leaves of the hemp plant; smoked or chewed for euphoric effect
3. verb

   clear of weeds
   “weed the garden”

   types:

   stub

   clear of weeds by uprooting them

   type of:

   remove, take, take away, withdraw

   remove something concrete, as by lifting, pushing, or taking off, or remove something abstract
4. noun

   a black band worn by a man (on the arm or hat) as a sign of mourning
   synonyms: mourning band

   type of:

   band

   a thin flat strip of flexible material that is worn around the body or one of the limbs (especially to decorate the body)