APHASIA
aphasia
(noun) inability to use or understand language (spoken or written) because of a brain lesion
Source: WordNet® 3.1
Etymology
Noun
aphasia (countable and uncountable, plural aphasias)
(pathology) A partial or total loss of language skills due to brain damage. Usually, damage to the left perisylvian region, including Broca's area and Wernicke's area, causes aphasia.
Source: Wiktionary
A*pha"si*a, Aph"a*sy, n. Etym: [NL. aphasia, Gr. aphasie.] (Med.)
Definition: Loss of the power of speech, or of the appropriate use of
words, the vocal organs remaining intact, and the intelligence being
preserved. It is dependent on injury or disease of the brain.
Source: Webster’s Unabridged Dictionary 1913 Edition