'Cachinnation' definitions:
Definition of 'cachinnation'
(from WordNet)
noun
Loud convulsive laughter
Definition of 'Cachinnation'
From: GCIDE
- Cachinnation \Cach`in*na"tion\ (k[a^]k`[i^]n*n[=a]"sh[u^]n), n. [L. cachinnatio, fr. cachinnare to laugh aloud, cf. Gr. kacha`zein.] Loud or immoderate laughter; -- often a symptom of hysterical or maniacal affections. [1913 Webster]
- Hideous grimaces . . . attended this unusual cachinnation. --Sir W. Scott. [1913 Webster]