loss of ability to produce articulate speech
• (n.) Loss of the power of speaking, while retaining the power of writing; -- a disorder of cerebral origin.
(ә-fe´me-ә) a term formerly used to describe a type of motor aphasia and more recently proposed as a synonym for apraxia of speech.
A·phe'mi·a noun [ New Latin , from Greek 
aphemia 1. Loss of the power of speaking, while retaining the power of writing; a disorder of cerebral origin. 2. A type of aphasia characterized by the inability to express ideas in spoken words.
a type of aphasia characterized by the inability to express ideas in spoken words.