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varve

[vahrv]
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noun Geology.
  1. (in lake sediments) an annual deposit usually consisting of two layers, one of fine materials and the other of coarse.
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Origin of varve

First recorded in 1920–25, varve is from the Swedish word varv a round, (complete) turn
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for varve

varve

noun geology
  1. a typically thin band of sediment deposited annually in glacial lakes, consisting of a light layer and a dark layer deposited at different seasons
  2. either of the layers of sediment making up this band
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Word Origin

C20: from Swedish varv layer, from varva, from Old Norse hverfa to turn
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

Word Origin and History for varve

n.

"annual deposit of silt in a lake bed," 1912, from Swedish varv "turn, layer," related to Old Norse hverfa, Old English hwerfan "to turn round" (see wharf).

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Online Etymology Dictionary, © 2010 Douglas Harper

varve in Science

varve

[värv]
  1. A layer or series of layers of sediment deposited in a body of still water in one year. Varves are typically associated with glacial lake deposits and consist of two layers-a lower, light-colored layer that consists primarily of sand and silt, and a darker upper layer that consists primarily of clay and organic matter. The lower layer is typically deposited in the summer by the rapid melt of glacial ice, and the upper layer is usually deposited in the winter by the slower settling of sediment through calm water. The thickness of the layers in a varve varies depending on the proximity to the margin of the glacier, with thicker layers forming closer to the glacial margin and thinner layers forming farther away from it. Varves have been used, like tree rings, to measure the ages of glacial deposits from the Pleistocene.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.