(n.) A loud burst of laughter; a horse laugh.

Homeric laughter be in stitches belly laugh boff boffola break up burst into laughter burst of laughter burst out burst out laughing burst with laughter bust a gut cachinnate cachinnation cackle chortle chuckle convulsion crow fit of laughter gales of laughter giggle go into convulsions ha-ha hearty laugh hee-haw hee-hee hilarity ho-ho horselaugh laugh laugh it up laugh outright laughing laughter nearly die laughing outburst of laughter peal of laughter risibility roar roar of laughter roar with laughter shake like jelly shake with laughter shout shout of laughter shriek snicker sniggle snort split split with laughter tee-hee titter yuck yuk-yuk