Definition of acorn noun from the Oxford Advanced American Dictionary

 

acorn

 noun
noun
NAmE//ˈeɪkɔrn//
 
 
jump to other results
  • the small brown nut of the oak tree, which grows in a base shaped like a cup
  • Idioms
    great/tall oaks from little acorns grow(saying)
     
    jump to other results
    something large and successful often begins in a very small way
    See the Oxford Advanced Learner's Dictionary entry: acorn