dyslexia
This term describes a specific neurobiological condition rather than a general lack of intelligence or a lack of education. It is typically used in clinical, educational, and psychological contexts to identify a deficit in phonological awareness, which makes decoding written language difficult.
As a medical and diagnostic term, it is treated as an uncountable noun. It refers to the condition as a whole; therefore, it does not have a plural form in standard usage. One does not refer to multiple "dyslexias" when discussing different people with the condition, but rather refers to the individuals as having dyslexia.
Meanings
A learning disorder characterized by a persistent difficulty in reading, spelling, and writing, often involving challenges with phonological processing and the ability to match sounds to letters.
The child was diagnosed with dyslexia and began receiving specialized tutoring to improve his reading skills.