Thud

Thud (thŭd) noun [ Confer Anglo-Saxon þōden a whirlwind, violent wind, or English thump .] A dull sound without resonance, like that produced by striking with, or striking against, some comparatively soft substance; also, the stroke or blow producing such sound; as, the
Found on http://www.encyclo.co.uk/webster/T/52

Thud

Thud intransitive verb & t. To make, or strike so as to make, a dull sound, or thud. « Hardly the softest thudding of velvety pads.» A. C. Doyle. « The waves break into spray, dash and rumble and thud below your feet.» H. F. Brown.
Found on http://www.encyclo.co.uk/webster/T/52

thud

[v] - make a dull sound 2. [v] - strike with a dull sound
Found on http://www.webdictionary.co.uk/definition.php?query=thud
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