the GNU version of the Collaborative International Dictionary of English
n. Loud or immoderate laughter; -- often a symptom of hysterical or maniacal affections.
The Century Dictionary and Cyclopedia
n. Loud or immoderate laughter.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. loud convulsive laughter
Word Usage
"The man began to laugh behind his moustaches, the which cachinnation was checked by an appealing look from the young lady; and he held out his hand and said,"