Definition of heartwood in English:

heartwood

Line breaks: heart|wood
Pronunciation: /ˈhɑːtwʊd
 
/

noun

[mass noun]
  • The dense inner part of a tree trunk, yielding the hardest timber.
    More example sentences
    • In the inner heartwood, these bodies were rarefying and cell walls became impregnated by a brown colour.
    • Decayed heartwood may sufficiently weaken trees enough to increase ice and wind mortality.
    • Only light wood was included in these samples; the chemistry of dark heartwood or disease-stained wood is known to be quite different from light wood.

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a slit made by cutting with a saw