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Definition of acorn noun from the Oxford Advanced American Dictionary

acorn

noun
/ˈeɪkɔrn/ acorn pronunciation American
 
the small brown nut of the oak tree, which grows in a base shaped like a cup
IDIOM

great/tall oaks from little acorns grow

(saying) something large and successful often begins in a very small waygreat oaks from little acorns growtall oaks from little acorns grow