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mogul

mogul, n.2
  (ˈməʊgəl)
  [? ad. S. German dial. mugel, mugl in same sense.]
  A bump on a ski-slope. Also attrib. Hence ˈmoguled a.

1961 R. Skepper Tackle Ski-ing this Way iii. 45 Moguls are large bumps, and occur most frequently in couloirs, on shoulders, in gullies, or very steep hills. They are usually caused by the piste skier's sheep complex... There is usually a mogul passage on every difficult run. 1965 Daily Express 26 Oct. 23/6 Crowded pistes and modern technique (a series of closely linked turns near the fall-line) results [sic] in large areas of bumps, or moguls, on the steeper portions of the piste. 1969 M. Heller Ski xv. 199 Closely related to mogul slopes is the heavily rutted traverse. 1970 Times 18 Dec. 20/2 At the crack of dawn the snowmobiles would be at work, compacting new snow and planing off exaggerated moguls (bumps). 1972 Dean & Smith Wisconsin 161/1 Every Wisconsin ski area has something unique to offer... Some even boast of ‘friendly moguls’. 1975 Friends (U.S.) Mar. 25 ‘Hot’ skiing over steep and moguled terrain.

Oxford English Dictionary

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