|Compare sapwood the central core of dark hard wood in tree trunks, consisting of nonfunctioning xylem tissue that has become blocked with resins, tannins, and oils|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|a scrap or morsel of food left at a meal.|
|heartwood (härt'wd') Pronunciation Key
The older, nonliving central wood of a tree or woody plant, usually darker and harder than the younger sapwood. Unlike the sapwood, it no longer conducts water, and its main function is the support of the tree.