heartwood Hear it!

heartwood definition

heart·wood (härt′wo̵od′)

noun

the hard, nonliving, older wood at the core of a tree trunk, usually dark in color and impervious to air and water; duramen

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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