a·pha·sia (ə-fā'zhə) n. Partial or total loss of the ability to articulate ideas or comprehend spoken or written language, resulting from damage to the brain caused by injury or disease.
[Greek, from aphatos, speechless : a-, not; see a-1 + phatos, spoken, speakable (from phanai, to speak; see -phasia).] a·pha'si·ac' (-zē-āk') n., a·pha'sic (-zĭk, -sĭk) adj. & n.