Mountainboardn.
/ˈmaʊntᵻnbɔːd/, U.S. /ˈmaʊnt(ə)nˌbɔrd/ A proprietary name (in form MountainBoard) for: a type of skateboard for use on downhill slopes, designed to emulate the action of a snowboard.
ΘΚΠ
society > leisure > sport > types of sport or game > skateboarding > [noun] > skateboard
skateboard1964
snakeboard1992
Mountainboard1996
1996 Fortune (Electronic ed.) 18 Mar. A feral, leather-clad young woman struck the correct pose for surfing down a mountainside atop her Outback Mountainboard.
1997 U.S. News & World Rep. (Electronic ed.) 30 June They invented the MountainBoard, an all-terrain skateboardlike contraption that allows snowboarders to carve turns year round.
2000 Independent on Sunday 16 July (Travel section) 3/5 The mountainboard was designed by snowboarders to get down mountains when ‘the white stuff’ was lacking.
Derivatives
ˈmountainboarder n.
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1996 News & Observer (Raleigh, N. Carolina) (Nexis) 14 Aug. e5 A MountainBoarder catches some air on the slopes near Colorado Springs, Colo., where the summertime version of snowboarding was invented.
1997 Daily Tel. 27 Dec. (Young Tel. section) 1/1 There are hundreds of mountainboarders taking to the slopes in the UK.
ˈmountainboarding n.
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1996 Detroit News (Nexis) 13 Mar. McConnell, the company's operation manager, likens mountainboarding to skiing—except with one ski and no snow.
2000 Wavelength Jan. 68/1 Mountainboarding came about when a few frustrated skaters in the states wanted to tackle some more adventurous terrain.
This is a new entry (OED Third Edition, March 2003; most recently modified version published online March 2022).
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n.1996