Definitions of weed
  1. noun
    any plant that crowds out cultivated plants
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    cultivated plant
    plants that are grown for their produce
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    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
    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
    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
    any of numerous plants having stinging hairs that cause skin irritation on contact (especially of the genus Urtica or family Urticaceae)
    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
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    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”
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    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
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    type of:
    a thin flat strip of flexible material that is worn around the body or one of the limbs (especially to decorate the body)
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