Definition of vegetable noun from the Oxford Advanced American Dictionary

      

    vegetable

     noun
    noun
    NAmE//ˈvɛdʒtəbl//
     
     
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  1. 1 (informal veggie) a plant or part of a plant that is eaten as food. Potatoes, beans, and onions are all vegetables green vegetables (= for example spinach ) root vegetables (= for example carrots ) a salad of raw vegetables a vegetable garden/patch/plot vegetable matter (= plants in general) compare animal, fruit, mineral
  2. 2 a person who is physically alive but not capable of much mental or physical activity, for example because of an accident or illness Severe brain damage turned him into a vegetable.
See the Oxford Advanced Learner's Dictionary entry: vegetable