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crevasse (krəvăsˈ), large crack in the upper surface of a glacier, formed by tension acting upon the brittle ice. Transverse crevasses occur where the grade of the glacier bed becomes suddenly steeper; longitudinal crevasses, where the glacier spreads over a wider valley or plain. Marginal crevasses are due to the strain built up when the central part moves faster than the sides.
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An open, nearly vertical fissure in a glacier or other mass of land ice or the earth, especially after earthquakes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1. a deep crack or fissure, esp in the ice of a glacier
2. US a break in a river embankment
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005