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

 

citron

 noun
noun
BrE BrE//ˈsɪtrən//
 
; NAmE NAmE//ˈsɪtrən//
 
[countable, uncountable]
 
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a yellow fruit like a large lemon Word Origin early 16th cent. (denoting the fruit): from French, from Latin citrus ‘citron tree’, on the pattern of limon ‘lemon’.
See the Oxford Advanced American Dictionary entry: citron