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2 definitions found
 for Bull thistle
From The Collaborative International Dictionary of English v.0.48 :

  Thistle \This"tle\, n. [OE. thistil, AS. [thorn]istel; akin to
     D. & G. distel, OHG. distila, distil, Icel. [thorn]istill,
     Sw. tistel, Dan. tidsel; of uncertain origin.] (Bot.)
     Any one of several prickly composite plants, especially those
     of the genera Cnicus, Craduus, and Onopordon. The name
     is often also applied to other prickly plants.
     [1913 Webster]
  
     Blessed thistle, Carduus benedictus, so named because it
        was formerly considered an antidote to the bite of
        venomous creatures.
  
     Bull thistle, Cnicus lanceolatus, the common large
        thistle of neglected pastures.
  
     Canada thistle, Cnicus arvensis, a native of Europe, but
        introduced into the United States from Canada.
  
     Cotton thistle, Onopordon Acanthium.
  
     Fuller's thistle, the teasel.
  
     Globe thistle, Melon thistle, etc. See under Globe,
        Melon, etc.
  
     Pine thistle, Atractylis gummifera, a native of the
        Mediterranean region. A vicid gum resin flows from the
        involucre.
  
     Scotch thistle, either the cotton thistle, or the musk
        thistle, or the spear thistle; -- all used national
        emblems of Scotland.
  
     Sow thistle, Sonchus oleraceus.
  
     Spear thistle. Same as Bull thistle.
  
     Star thistle, a species of Centaurea. See Centaurea.
  
     Torch thistle, a candelabra-shaped plant of the genus
        Cereus. See Cereus.
  
     Yellow thistle, Cincus horridulus.
        [1913 Webster]
  
     Thistle bird (Zool.), the American goldfinch, or
        yellow-bird ({Spinus tristis); -- so called on account of
        its feeding on the seeds of thistles. See Illust. under
        Goldfinch.
  
     Thistle butterfly (Zool.), a handsomely colored American
        butterfly ({Vanessa cardui) whose larva feeds upon
        thistles; -- called also painted lady.
  
     Thistle cock (Zool.), the corn bunting ({Emberiza
        militaria). [Prov. Eng.]
  
     Thistle crown, a gold coin of England of the reign of James
        I., worth four shillings.
  
     Thistle finch (Zool.), the goldfinch; -- so called from its
        fondness for thistle seeds. [Prov. Eng.]
  
     Thistle funnel, a funnel having a bulging body and flaring
        mouth.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  bull thistle
      n 1: European thistle with rather large heads and prickly
           leaves; extensively naturalized as a weed in the United
           States [syn: bull thistle, boar thistle, spear
           thistle, Cirsium vulgare, Cirsium lanceolatum]

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