a·pha·sia 
(ə-fāzhə)
(ə-fāzhə)n.
Partial or total loss of the ability to articulate ideas or comprehend spoken or written language, resulting from damage to the brain from injury or disease.
[Greek, from aphatos, speechless : a-, not; see A-1 + phatos, spoken, speakable (from phanai, to speak; see -PHASIA).]
a·phasi·ac′ (-zē-ăk′) n.
a·phasic (-zĭk, -sĭk) adj. & n.