Gelastic a. : Pertaining to laughter; used in laughing.

Example:
Are there any books specifically about Gelastic(laughing) seizures? I can't find any.?

Taxonomy
Gelastic epilepsy, free encyclopedia, laughter, syncope, Seinfeld, search, medical terminology, symptom, syndrome, Greek, laugh, seizures, spells, the brain, paper, long-running, US TV show, Cox.

Defination from the web:
Gelastic is a term often used in medical terminology to indicate an association of a symptom or syndrome with laughter. ... Gelastic epilepsy or epileptic seizure. ... Gelastic syncope (referred to in one paper also as "Seinfeld" syncope after the famous long-running US TV show: ...