cachinnation

cachinnate

[kak-uh-neyt]
verb (used without object), cachinnated, cachinnating.
to laugh loudly or immoderately.

Origin:
1815–25; < Latin cachinnātus (past participle of cachinnāre to laugh aloud, laugh immoderately), equivalent to cachinn- laugh aloud + -ātus -ate1

cachinnation, noun
cachinnator, noun
cachinnatory [kak-uh-nuh-tawr-ee, -tohr-ee, kuh-kin-uh-] , adjective
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World English Dictionary
cachinnate (ˈkækɪˌneɪt)
 
vb
(intr) to laugh loudly
 
[C19: from Latin cacchināre, probably of imitative origin]
 
cachin'natory
 
adj

cachinnation (ˌkækɪˈneɪʃən)
 
n
1.  raucous laughter
2.  psychiatry inappropriate laughter, sometimes found in schizophrenia

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

cachinnate
"to laugh loudly or immoderately," 1824, from L. cachinatum, pp. of cachinnare (see cachinnation).

cachinnation
"loud laughter," 1620s, from L. cachinnationem (nom. cachinatio), noun of action from cachinnare "to laugh immoderately or loudly," of imitative origin. Cf. Skt. kakhati "laughs," Gk. kakhazein "to laugh loudly," O.H.G. kachazzen, Eng. cackle, Arm. xaxanc'.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cachinnation cach·in·na·tion (kāk'ə-nā'shən)
n.
Loud, hard, or compulsive laughter without apparent cause.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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