grammarian
n.
"student of or writer on (Latin) grammar; philologist, etymologist;" in general use, "learned man," late 14c., from Old French gramairien (Modern French grammairien) "grammarian, wise man, person who knows Latin; magician," agent noun from grammaire (see grammar).
〔蒋〕[gram=write，something written of drawn 写，画，文字，图形，-ian名词后缀，表示人] 语法学家，文法家