heartwood heartwise • heartwort · · · Info · Definitions · Synonyms · Characters · · heartwood · · Text Latin · · Script 9 · · Length Definitions · · · (noun) the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood. Synonyms: duramen. · · Noun Definition 1 Synonyms · · · duramen · · Synonym 1 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 w latin small letter w U+0077