arête

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arête

a sharp ridge separating two cirques or glacial valleys in mountainous regions
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

arête

[a′rāt]
(geology)
Narrow, jagged ridge produced by the merging of glacial cirques. Also known as arris; crib; serrate ridge.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.