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The Collaborative International Dictionary
Grammaticaster

Grammaticaster \Gram*mat"icas"ter\, n. [LL.] A petty grammarian; a grammatical pedant or pretender.

My noble Neophite, my little grammaticaster.
--B. Jonson.

Wiktionary
grammaticaster

n. (context derogatory English) A pedantic, inferior grammarian.