Definition of Granny Smith noun from the Oxford Advanced Learner's Dictionary

 

Granny Smith

 noun
noun
BrE BrE//ˌɡræni ˈsmɪθ//
 
; NAmE NAmE//ˌɡræni ˈsmɪθ//
 
 
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a type of green apple Word Origin late 19th cent.: named after Maria Ann (Granny) Smith (c.1801–1870), who first produced such apples.
See the Oxford Advanced American Dictionary entry: Granny Smith