Hypertext Webster Gateway: "horselaugh"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Horselaugh \Horse"laugh`\, n.
A loud, boisterous laugh; a guffaw. --Pope.
From WordNet (r) 1.7 (wn)
horselaugh
n : a loud laugh that sounds like a horse neighing [syn: {hee-haw},
{ha-ha}, {haw-haw}]
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