dysorthography dysorthography dysorthography is a disorder of spelling which accompanies dyslexia by a direct consequence of the phonological disorder. in the american classification from the american psychiatric association (apa) and the classification from the world health organization (who), it is a subtype of specific learning disorder with impairment in written expression. dysorthographyspecialtyneurology, pediatrics a related term, dysgraphia, is a disorder of writing ability.