Definition of oak noun from the Oxford Advanced American Dictionary

     

    oak

     noun
    noun
    NAmE//oʊk//
     
     
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  1. 1[countable, uncountable] (also oak tree) a large tree that produces small nuts calledacorns. Oaks are common in northern countries and can live to be hundreds of years old a gnarled old oak tree forests of oak and pine see also poison oak
  2. 2[uncountable] the hard wood of the oak tree oak beams This table is made of solid oak.
  3. Idioms
    great/tall oaks from little acorns grow(saying)
     
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    something large and successful often begins in a very small way
See the Oxford Advanced Learner's Dictionary entry: oak

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