- 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.
From Ancient Greek ὑπέρ (huper, “over”) + γελαστής (gelastēs, “laugher”), from γελάω (gelaō, “I laugh”).