mountain sickness

illness caused by thin air on high mountains 高山病.

motorist, motorize, motorise, motorway, mottle, mottled, motto, mould, mould (US mold), moulder (US molder), moulding (US molding), mouldy (US moldy), moult, moult (US molt), mound, mount, Mount Fuji, mountain, mountain ash, mountain chain, mountain range, mountain lion, mountain side, mountaineer, mountaineering, mountainous, mountains, mountainside, mountebank, mounted, Mountie, mounting, mourn, mourner, mournful, mournfully, mournfulness, mourning, mouse, mouser, mousetrap, moussaka,