cachinnatio
From LSJ
Ὕπνος πέφυκε σωμάτων σωτηρία → Incolumitas est corporis nostri sopor → Der rechte Weg ist zur Gesunderhaltung Schlaf
Latin > English (Lewis & Short)
căchinnātĭo: ōnis, f. id.,
I a violent laughing, immoderate laughter: sine ullā suspitione nimiae suspitionis, Auct. Her. 3, 14, 25: ut si ridere concessum sit, vituperetur tamen cachinnatio, Cic. Tusc. 4, 31, 66.