from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A growth layer in secondary xylem seen in a cross section of a woody stem or branch.
- noun A layer of calcareous material or other substance deposited in a single period of growth of an animal, as in an otolith or a turtle scute.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Any of the
concentricrings formed in the trunkof a treeby the annual growthof wood
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an annual formation of wood in plants as they grow
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