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annual rings

The Columbia Encyclopedia, Sixth Edition
annual rings the growth layers of wood that are produced each year in the stems and roots of trees and shrubs. In climates with well-marked alternations of seasons (either cold and warm or wet and dry), the wood cells produced when water is easily available and growth is rapid (generally corresponding to the spring or wet season) are often noticeably larger and have thinner walls than those produced later in the season when the supply of water has diminished and growth is slower. There is thus a sharp contrast between the small, thick-walled late-season wood cells produced one year, and... Read more
annual ring
The Oxford American College Dictionary

an·nual ring • n. another term for tree ring .

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annual ring
World Encyclopedia

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 ...

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