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2 definitions found
 for Urtica dioica
From The Collaborative International Dictionary of English v.0.48 :

  Nettle \Net"tle\, n. [AS. netele; akin to D. netel, G. nessel,
     OHG. nezz["i]la, nazza, Dan. nelde, n[aum]lde, Sw.
     n[aum]ssla; cf, Lith. notere.] (Bot.)
     A plant of the genus Urtica, covered with minute sharp
     hairs containing a poison that produces a stinging sensation.
     Urtica gracilis is common in the Northern, and Urtica
     chamaedryoides in the Southern, United States. The common
     European species, Urtica urens and Urtica dioica, are
     also found in the Eastern united States. Urtica pilulifera
     is the Roman nettle of England.
     [1913 Webster]
  
     Note: The term nettle has been given to many plants related
           to, or to some way resembling, the true nettle; as:
  
     Australian nettle, a stinging tree or shrub of the genus
        Laportea (as Laportea gigas and Laportea moroides);
        -- also called nettle tree.
  
     Bee nettle, Hemp nettle, a species of Galeopsis. See
        under Hemp.
  
     Blind nettle, Dead nettle, a harmless species of
        Lamium.
  
     False+nettle+({Baehmeria+cylindrica">False nettle ({Baehmeria cylindrica), a plant common in
        the United States, and related to the true nettles.
  
     Hedge nettle, a species of Stachys. See under Hedge.
  
     Horse+nettle+({Solanum+Carolinense">Horse nettle ({Solanum Carolinense). See under Horse.
  
     nettle tree.
     (a) Same as Hackberry.
     (b) See Australian nettle (above).
  
     Spurge nettle, a stinging American herb of the Spurge
        family ({Jatropha urens).
  
     Wood+nettle,+a+plant+({Laportea+Canadensis">Wood nettle, a plant ({Laportea Canadensis) which stings
        severely, and is related to the true nettles.
        [1913 Webster]
  
     Nettle cloth, a kind of thick cotton stuff, japanned, and
        used as a substitute for leather for various purposes.
  
     Nettle rash (Med.), an eruptive disease resembling the
        effects of whipping with nettles.
  
     Sea nettle (Zool.), a medusa.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  Urtica dioica
      n 1: perennial Eurasian nettle established in North America
           having broad coarsely toothed leaves with copious stinging
           hairs [syn: stinging nettle, Urtica dioica]

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