different between hypergelast vs gelastic

English

From Ancient Greek ???? (hupér, “over”) + ???????? (gelast?s, “laugher”), from ????? (gelá?, “I laugh”).

hypergelast (plural hypergelasts)

someone who laughs excessively.
- 1992, Henry Jenkins, What Made Pistachio Nuts? (Columbia University Press)
  America had become a laughing nation, a country of frivolists and hypergelasts, a culture dangerously out of control.
Synonym: cachinnator
Antonym: agelast

gelastic

Pertaining to laughter, used in laughing, or to be the subject of laughter.
(medicine) Relating to a particularly severe form of epileptic fit, in which there is a sudden burst of energy.

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