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

  • n. A growth layer in secondary xylem seen in a cross section.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of the concentric rings formed in the trunk of a tree by the annual growth of wood

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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