Loud, uncontrollable, convulsive laughter.
From Latin 'cachinnare' (to laugh loudly), itself an onomatopoeia. The Romans distinguished between 'risus' (normal laughter) and 'cachinnatio' (that helpless, ugly, can't-stop belly laugh).
The Romans had a special word for laughing SO hard you can't breathe, tears are streaming, and you sound like a seal! That snort-laugh that takes over your whole body? CACHINNATION! 🤣
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