anchor ice

noun
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.


Origin:
1805–15, Americanism

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World English Dictionary
anchor ice
 
n
(Canadian) ice that forms at the bottom of a lake or river

Collins English Dictionary - Complete & Unabridged 10th Edition
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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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