annual rings

annual ring

noun
an annual formation of wood in plants, consisting of two concentric layers, one of springwood and one of summerwood.
Also called growth ring, tree ring.


Origin:
1875–80

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
annual ring
 
n
Also called: tree 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 climates

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
annual ring  
See under growth ring.
The American Heritage® Science Dictionary
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