/euh lek"see euh/ , n. Pathol.
a neurologic disorder marked by loss of the ability to understand written or printed language, usually resulting from a brain lesion or a congenital defect. Also called word blindness .
[ 1875-80; A- 6 + Gk léx ( is ) speech ( leg- s. of légein to speak + -sis -SIS) + -IA; altered meaning by assoc. of -lex- with LEXICON, etc. ]