Alexia

A*lex"i*a, n. [NL.; a- not + Gr. speech, fr.  to speak, confused with L. legere to read.] (Med.)

(a) As used by some, inability to read aloud, due to brain disease.

(b) More commonly, inability, due to brain disease, to understand written or printed symbols although they can be seen, as in case of word blindness.