A grammarian is someone who studies, writes about, teaches, and/or loves grammar. Some English teachers are grammarians — they’re the ones who don’t mind spending an afternoon discussing the Oxford comma.
In case you’re underwhelmed, know that the word grammarian comes from the Old French word gramairien for "wise man, person who knows Latin, or magician." English-speaking grammarians don’t necessarily know Latin these days, but it wouldn’t hurt. Grammarians often write books on the parts of speech, diagramming sentences, or anything else about grammar and syntax. Wise? Yes. Magicians? Rarely.
Definitions of grammarian
noun
a linguist who specializes in the study of grammar and syntax
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