cachinnate /ˈkakəˌnāt, ˈkækəˌneɪt 
/ ▸ verb [no object] rare laugh loudly.
– DERIVATIVES cachinnation /ˌkakəˈnāSH(ə)n, ˌkækəˈneɪʃ(ə)n / noun – ORIGIN early 19th century : from Latin cachinnat- ‘laughed loudly’, from the verb cachinnare, of imitative origin.
EnglishOxford New American Dictionary
