half-pipe

or half pipe

[haf-pahyp, hahf-]

noun

a half-moon-shaped chute or ramp used by snowboarders and skateboarders to provide a takeoff for a jump.

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British Dictionary definitions for half-pipe

half-pipe

noun

a structure with a U-shaped cross-section, used in performing stunts in skateboarding, snowboarding, rollerblading, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012