[ hahrt-wood ]

  1. the hard central wood of the trunk of an exogenous tree; duramen.

Compare Meanings

Click for a side-by-side comparison of meanings. Use the word comparison feature to learn the differences between similar and commonly confused words.

Origin of heartwood

First recorded in 1795–1805; heart + wood1

Words Nearby heartwood

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use heartwood in a sentence

  • The living outer portion of a trunk or large branch of a tree between the heartwood and the bark.

    Michigan Trees | Charles Herbert Otis

British Dictionary definitions for heartwood


/ (ˈhɑːtˌwʊd) /

  1. the central core of dark hard wood in tree trunks, consisting of nonfunctioning xylem tissue that has become blocked with resins, tannins, and oils: Compare sapwood

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for heartwood


[ härtwud′ ]

  1. The older, nonliving central wood of a tree or woody plant, usually darker and harder than the younger sapwood. Unlike the sapwood, it no longer conducts water, and its main function is the support of the tree.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.