Dyslexia

Dyslexia is a type of reading disability usually manifested as a difficulty with written language, particularly with reading and spelling. Evidence suggests that it is a result of a difference in how the brain processes written and/or verbal language. It is separate and distinct from reading difficulties resulting from other causes, such as deficiencies in intelligence, non-neurological deficiency with vision or hearing, or from poor or inadequate reading instruction.

The word dyslexia comes from the Greek words δυς- dys- ("impaired") and λέξις lexis ("word"). People with dyslexia are called dyslexic or dyslectic.