dyslexia \dys*lex"i*a\ (d[i^]s*l[e^]ks"[-e]*[.a]) n.
Any of various reading disorders caused by a damaged or
congenitally faulty structure within the central nervous
system, and causing an impairment of the ability to interpret
spatial relationships or to integrate auditory and visual
information. A common example is when letter sequences are
interpreted as inverted in order, as in bat/tab. --RHUD
[PJC]