Definition of weed noun from the Oxford Advanced American Dictionary

     

    weed

     noun
    noun
    NAmE//wid//
     
     
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  1. 1[countable] a wild plant growing where it is not wanted, especially among crops or garden plants The yard was overgrown with weeds.
  2. 2[uncountable] any wild plant without flowers that grows in water and forms a green floating mass
  3. 3 [uncountable] (informal) the drug cannabis
  4. 4 the weed [singular] (humorous) tobacco or cigarettes I wish I could give up the weed (= stop smoking).
See the Oxford Advanced Learner's Dictionary entry: weed