Definition of biology noun from the Oxford Advanced American Dictionary

      

    biology

     noun
    noun
    NAmE//baɪˈɑlədʒi//
     
    [uncountable]
     
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  1. 1the scientific study of the life and structure of plants and animals a degree in biology compare botany, zoology
  2. 2the way in which the body and cells of a living thing behave How far is human nature determined by biology? the biology of marine animals
See the Oxford Advanced Learner's Dictionary entry: biology