grammarian

[ gruh-mair-ee-uh n ]
/ grəˈmɛər i ən /

noun

a specialist or expert in grammar.
a person who claims to establish or is reputed to have established standards of usage in a language.

Origin of grammarian

1350–1400; Middle English gramarien < Old French gramairien. See grammar, -ian
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for grammarian

grammarian

/ (ɡrəˈmɛərɪən) /

noun

a person whose occupation is the study of grammar
the author of a grammar
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012