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

 

sideburn

 noun
noun
BrE BrE//ˈsaɪdbɜːn//
 
; NAmE NAmE//ˈsaɪdbɜːrn//
 
(British English also sideboard)[usually plural] Facial hair
 
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hair that grows down the sides of a man’s face in front of his ears See related entries: Facial hair Word Origin late 19th cent.: originally burnside, from the name of General Burnside (1824–81), who wore sideburns.
See the Oxford Advanced American Dictionary entry: sideburn