English

Noun

hypergelast ‎(plural hypergelasts)

1. someone who laughs excessively.

   "America had become a laughing nation, a country of frivolists and hypergelasts, a culture dangerously out of control." - Henry Jenkins; What Made Pistachio Nuts?; Columbia University Press; 1992.

Antonyms

• (someone who laughs excessively): agelast

Synonyms

• (someone who laughs excessively): cachinnator