from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The layer of wood formed in a plant during a single year. Annual rings appear concentric when viewed in cross section.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The layer of wood, observed as one of many concentric rings when cut, formed during one year of a plant's growth

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an annual formation of wood in plants as they grow


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