A language disorder involving loss or severe impairment of the ability to use or understand grammar correctly.
From Greek 'a-' (without) + 'gramma' (letter/grammar) + 'phasis' (speech), literally meaning 'speech without grammar,' a medical term from 19th-century neurology.
Stroke patients with agrammaphasia can sometimes sing or curse fluently but can't construct sentences—it shows that different parts of our brain handle different language skills!
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