Definition of lemon adjective from the Oxford Advanced Learner's Dictionary

 

lemon

 adjective
adjective
BrE BrE//ˈlemən//
 
; NAmE NAmE//ˈlemən//
 
 
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(also lemon yellow) pale yellow in colour Word Origin Middle English: via Old French limon (in modern French denoting a lime) from Arabic līmūn (a collective term for fruits of this kind); compare with lime (the fruit).
See the Oxford Advanced American Dictionary entry: lemon