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Definisi 'heartwood'
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English to English noun
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the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood |  | source: wordnet30
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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. | | source: webster1913
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