someone who laughs excessively.

Etymology
From Ancient Greek ὑπέρ (huper, “over”) + γελαστής (gelastēs, “laugher”), from γελάω (gelaō, “I laugh”).
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
by Arash.Amiri October 18, 2012

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