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anchor ice

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noun
  1. ice formed below the surface of a body of water that attaches either to a submerged object or to the bottom.
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Origin of anchor ice

An Americanism dating back to 1805–15
Also called bottom ice, ground ice.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for anchor ice

anchor ice

noun
  1. Canadian ice that forms at the bottom of a lake or river
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012