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Webster 1913 Edition

Heartwood

Heart′woodˊ

(härt′woŏdˊ)
,
Noun.
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
.

Definition 2024

heartwood

heartwood

English

A section of a Yew, showing 27 annual growth rings, pale sapwood and dark heartwood, and pith (centre dark spot). The dark radial lines are small knots.

Noun

heartwood ‎(countable and uncountable, plural heartwoods)

  1. The wood nearer the heart of a stem or branch, different in color from the sapwood
    A popular myth is that heartwood is stronger than sapwood

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