‖n. [ NL.; a- not + Gr. le`xis speech, fr. le`gein to speak, confused with L. legere to read. ] (Med.) (a) Inability to read aloud, due to brain disease; the meanings of the words is nevertheless understood. Called also motor alexia. (b) Inability, due to brain disease, to understand written or printed symbols. Called also Word blindness and text blindness. [ Webster 1913 Suppl. + AS ]