annual ring
–noun | an annual formation of wood in plants, consisting of two concentric layers, one of springwood and one of summerwood. |
Origin: 1875–80
| Main Entry: | tree ring1 |
| Part of Speech: | n |
| Definition: | any of the concentric rings of the cross-section of a tree trunk, representing a year's growth; the layer of wood produced by a year's growth in a woody plant; also called annual ring |
| Main Entry: | tree ring2 |
| Part of Speech: | n |
| Definition: | one of the markings on fauna that correspond to a year's growth; also called annulus |
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The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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