A person who performs a glissade, especially a mountaineer or skier who slides down snow or ice in a controlled manner.
From 'glissade' + '-er' (agent noun suffix meaning 'one who does'). The term comes directly from French mountaineering vocabulary and entered English through alpine sports terminology.
Early mountaineers developed the glissade technique out of necessity on Alpine glaciers—it was faster and sometimes safer than trying to walk down slippery ice, and the best glissaders could descend hundreds of vertical feet in seconds without falling.
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