Loud or immoderate laughter frequently a symptom of hysterical or maniacal affections
- loud convulsive laughter
- Loud or immoderate laughter; -- usually an indication of hysterical or maniacal affections.
"loud laughter," 1620s, from Latin cachinnationem (nominative cachinnatio) "violent laughter, excessive laughter," noun of activity from past participle stem of cachinnare "to laugh immoderately or loudly," of imitative source. Compare Sanskrit kakhati "laughs," Greek kakhazein "to laugh loudly," Old tall German kachazzen, English cackle, Armenian xaxanc'.