cachinnate /ˈkakɪneɪt 
/ ▸ verb [no object] rare laugh loudly: I chuckled, guffawed, chortled, and cachinnated my way through the book.
– DERIVATIVES cachinnation /ˌkakɪˈneɪʃn / noun – ORIGIN early 19th century: from Latin cachinnat- ‘laughed loudly’, from the verb cachinnare, of imitative origin.
EnglishOxford Dictionary of English
