an annual formation of wood in plants, consisting of two concentric layers, one of springwood and one of summerwood.
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Origin of annual ring
First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for annual ring
a ring of wood indicating one year's growth, seen in the transverse section of stems and roots of woody plants growing in temperate climatesAlso called: tree ring
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
Science definitions for annual ring
See under growth ring.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.