noun.
Loss of the ability to read, usually caused by brain lesions.
The Century Dictionary and Cyclopedia
noun.
Inability to read, as the result of a morbid or diseased condition of nervous centers not involving loss of sight; word-blindness; text-blindness.
the GNU version of the Collaborative International Dictionary of English
noun.
As used by some, inability to read aloud, due to brain disease.
noun.
More commonly, inability, due to brain disease, to understand written or printed symbols although they can be seen, as in case of word blindness.