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The Collaborative International Dictionary
Agrammatist

Agrammatist \A*gram"ma*tist\, n. [Gr. ? illiterate; 'a priv. + ? letters, fr. ? to write.] A illiterate person. [Obs.]
--Bailey. [1913 Webster] ||

Wiktionary
agrammatist

n. One suffering from agrammatism.