angle repose

angle of repose

noun Geology.
the maximum slope, measured in degrees from the horizontal, at which loose solid material will remain in place without sliding.
Compare angle of slide.

1875–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
angle of repose
the maximum angle to the horizontal at which rocks, soil, etc, will remain without sliding

Collins English Dictionary - Complete & Unabridged 10th Edition
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