heartwood

heartwood has 2 senses in the JumbleFix dictionary. Letters: 9.

Definitions

• 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.
• n.. the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood