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growth ring

Origin of growth ring
1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for growth ring
  • Legal scallops possess a defined, raised, annual growth ring.
  • Legal scallops possess a defined raised annual growth ring.
  • The ring closest to the bark is the youngest and final growth ring.
  • The ring closest to the center of the tree is the oldest growth ring.
  • One fast and one slow growth ring correspond to one yearly growth cycle, called an annulus.
  • Bore the dominant conifer trees within the riparian zone and average the growth ring counts.
  • Each couplet of twin bands was considered to be a distinct growth ring.
  • The two layers form a tree ring or annual growth ring.
British Dictionary definitions for growth ring

growth ring

another name for annual 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
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growth ring in Science
growth ring  

  1. A layer of wood formed in a plant during a single period of growth. Growth rings are visible as concentric circles of varying width when a tree is cut crosswise. They represent layers of cells produced by vascular cambium. ◇ Most growth rings reflect a full year's growth and are called annual rings. But abrupt changes in the environment, especially in the availability of water, can cause a plant to produce more than one growth ring in a year. See more at dendrochronology.

  2. A similar layer in a part of an animal marking a period of growth, such as an annulus in a fish scale.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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