cachinnō

1. Ridere and cachinnari denote an audible laugh; ridere, a joyous and temperate laugh, like γελᾶν; cachinnari (from hinnire) an unrestrained and resounding fit of laughter, like καγχάζειν; whereas subridere, and renidere only a visible smile; subridere, as the expression of a waggish or satirical humor; renidere (from nidor, ὄνειδος,) as the expression of a friendly, and also of a dissembling humor, like μειδιᾶν. Cic. Tusc. iv. 31. Si ridere concessum sit, vituperatur tamen cachinnatio. Verr. iii. 25. Herenn. iii. 14, 25. Ovid, Art. iii. 287. 2. Deridere denotes laughing at, as an act of loftiness and contempt, inasmuch as others are laughed down, like καταγελᾶν; irridere, as an act of insolence and malignant pleasure, inasmuch as others are laughed at before their faces, like ἐγγελᾶν. Cic. Orat. iii. 14. Istos omnes deridete atque contemnite; and Verr. v. 92: comp. with N. D. ii. 3. Claudius etiam per jocum deos irridens; and Suet. Aug. 36. (iii. 251.)