cachinnate,v.|ˈkækɪneɪt| [f. L. cachinnā-re: see -ate.] intr. To laugh loudly or immoderately. 1824De Quincey Walladmor in London Mag. X. 354 Not a publisher but cachinnates from Leipsic to Moscow.1837Fraser's Mag. XVI. 432 Groggan..only cachinnated the more vehemently.