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A layer or series of layers of sediment deposited in a body of still water in one year.
[Swedish varv, layer, from varva, to bend, from Old Norse hverfa.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Geological Science) 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. (Geological Science) either of the layers of sediment making up this band
[C20: from Swedish varv layer, from varva, from Old Norse hverfa to turn]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a pair of thin contrasting layers of lake-bed sediment, representing a year's cycle of sedimentation.
[1920–25; < Swedish varv a round, (complete) turn]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.