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

 

grammarian

 noun
noun
BrE BrE//ɡrəˈmeəriən//
 
; NAmE NAmE//ɡrəˈmeriən//
 
 
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a person who is an expert in the study of grammar Word Origin Middle English: from Old French gramarien, from gramaire, via Latin from Greek grammatikē (tekhnē) ‘(art) of letters’, from gramma, grammat- ‘letter of the alphabet, thing written’.
See the Oxford Advanced American Dictionary entry: grammarian