Definition of greengage noun from the Oxford Advanced Learner's Dictionary

 

greengage

 noun
noun
BrE BrE//ˈɡriːnɡeɪdʒ//
 
; NAmE NAmE//ˈɡriːnɡeɪdʒ//
 
Fruit
 
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a small soft green fruit that is a type of plum a greengage tree See related entries: Fruit Word Origin early 18th cent.: named after Sir William Gage (1657–1727), the English botanist who introduced it to England.
See the Oxford Advanced American Dictionary entry: greengage