: a small buoyant board usually less than three feet long that is used in surf riding
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/bel"ee bawrd', -bohrd'/, n.
a small surfboard, usually 3-4 ft. (0.9-1.2 m) long, for riding waves on one's belly, sometimes used in conjunction with swim fins.
[1960-65; BELLY + BOARD]
Useful english dictionary. 2012.