grammarian
Grammarian (noun) means a person who studies grammar, whether as a serious academic discipline or in a more casual, unscientific way. Example: “The dictionary's introduction was written by a well-known grammarian.”
How to use grammarian
Learner’s notesIn plain EnglishA grammarian is someone who studies grammar closely, or who likes correcting other people's mistakes.
The pedantic sense is used informally and can carry a mildly mocking tone.
Use the word neutrally for a grammar scholar, but expect it to sound teasing when aimed at a nitpicky friend.
Trace the full origin ↓Fill the gap
Can you complete this real example?
The dictionary's introduction was written by a well-known _____.
Etymology
Grammarian comes from Middle English gramarien, which was itself taken from Middle French gramairien. The word eventually took the place of the older native English term for someone skilled in grammar.