The Collaborative International Dictionary of English v.0.48:

Aphrasia \A*phra"si*a\, n. [NL., fr. Gr. 'a priv. + fra`sis
   speech.] (Med.)
   (a) = Dumbness.
   (b) A disorder of speech in which words can be uttered but
       not intelligibly joined together.
       [Webster 1913 Suppl.]