noun. A peak, ridge, or hill of bedrock that protrudes from a glacier's surface.

noun. A crest or ridge of rock appearing above the surface of the inland ice in Greenland.

noun. In Greenland, an insular hill or mountain surrounded by an ice sheet.

noun. A mountain top or rocky element of a ridge that is surrounded by glacial ice but is not covered by ice; a peak protruding from the surface ice sheet.

"At Merger, a "nunatak" or rocky peak sticking out of the ice, the only evidence of a visit by U.S. scientists in 1975 is a tiny metal stake covered by a pile of rocks."