n. 失读症

[医] 读字不能, 失读[症]

[ noun ]
inability to perceive written words
<noun.state>

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.
[Webster 1913 Suppl.]