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
Sorry, no etymologies found.