annual ring

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annual ring (growth ring) Concentric circles visible in cross-sections of woody stems or trunks. Each year the cambium layer produces a layer of xylem, the vessels of which are large and thin-walled in the spring and smaller and thick-walled in the summer, creating a contrast between the rings. Used to determine the age of trees, the thickness of these rings also reveals environmental conditions during a tree's lifetime.

annual ring

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annual ring See tree ring.

annual ring

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annual ring See TREE-RING.

annual ring

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annual ring See growth ring.