American Heritage Dictionary
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
Elsewhere on the web
Roget's II: The New Thesaurus, Third Edition gives these synonyms for goofus: foolheaded, for grins, freaky, funny, and gelastic.— MyLinkVault Newest Links
Unlike most such growths, a hypothalamic hamartoma is symptomatic; it most often causes gelastic seizures, and can cause visual problems, other seizures, rage disorders associated with hypothalamic diseases, and early onset of puberty.— Find Me A Cure
Man had been defined as a gelastic apteryx, but in view of the attitude of women towards the Plumage Bill the definition could hardly be allowed to fit the requirements of the spindle side of creation.— Punch, or the London Charivari, Vol. 146, April 29, 1914

Century Dictionary (1)
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