American Heritage Dictionary
(3)
Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
But in all of them I heard a certain sound: a thud--thud--thud, like the beating of some big engine; and I discovered, from the flaring of my matches, that a steady current of air set down the shafts.— The Time Machine
And then it came again--thud, thud, thud, and then a silence that was almost worse than the noise of the door; for I kept fancying that some awful thing was stealing upon me along the corridor.— Carnacki, the Ghost Finder
Thud has been looked up 259 times, favorited 0 times, listed 15 times, and commented on once.

American Heritage Dictionary (1)
Century Dictionary (2)
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