You searched for: “cachinnating”
cachinnate (KAK uh nayt) (verb), cachinnates; cachinnated; cachinnating
1. To laugh very loudly, hard, or convulsively: While eating dinner with their friends, Seth and Gail, Seth cachinnated so much that Mike's wife and Stan had to make an excuse to go home early because it was just too much to tolerate.

There are times when some people cachinnate in an immoderate form of laughter; or excessive, hysterical laughter, because of hysteria or certain kinds of psychoses.

2. Etymology: from the Latin verb cachinnare, "to laugh loudly".
To laugh very loudly.
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To laugh hard or convulsively
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This entry is located in the following unit: English Words in Action, Group C (page 1)