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Table of Contents POS
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

heartwood

POS

Noun

HYPHEN

heart=wood

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WORDNET DICTIONARY

Noun heartwood has 1 sense

heartwood(n = noun.plant) duramen - the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood; Array

is a kind of wood

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CIDE DICTIONARY

heartwood, n.

The hard, central part of the trunk of a tree, consisting of the old and matured wood, and usually differing in color from the outer layers. It is technically known as duramen, and distinguished from the softer sapwood or alburnum. [1913 Webster]

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OXFORD DICTIONARY

heartwood, n. the dense inner part of a tree-trunk yielding the hardest timber.

For further exploring for "heartwood" in Webster Dictionary Online