Definition - A brain disorder that reduces your ability to write coherently. Evidently, it is quite common amongst visual-art critics (see example below).

Example -
"As my story is an august tale of fathers and sons, real and imagined, the biography here will fitfully attend to the putative traces in Manet’s work of “les noms du père,” a Lacanian romance of the errant paternal phallus (”Les Non-dupes errent”), a revised Freudian novella of the inferential dynamic of paternity which annihilates (and hence enculturates) through the deferred introduction of the third term of insemination the phenomenologically irreducible dyad of the mother and child."
(by Steven Z. Levine from an anthology called Twelve Views of Manet’s “Bar”)

Etymology -
The word was coined by combining the Greek a, not, with graphos, writing.

Oxford English Dictionary -
Its first citation is from 1871:
"Agraphia, in which the patient speaks, but blunders sadly in writing."
(Academy 15 Mar. 183/2 )

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