anchor ice

ice formed below the surface of a body of water that attaches either to a submerged object or to the bottom.
Also called bottom ice, ground ice.

1805–15, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anchor ice
(Canadian) ice that forms at the bottom of a lake or river

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Stream channels are naturally dynamic and subject to disturbance from annual flooding, anchor ice, and other natural events.
Sub-freezing stream temperatures and anchor ice occurs during extended sub-zero periods.
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