Definition of heartwood in English:

heartwood

Syllabification: heart·wood
Pronunciation: /ˈhärtˌwo͝od
 
/

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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Word of the day erroneous
Pronunciation: ɪˈrəʊnɪəs
adjective
wrong; incorrect