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The white and softer part of wood, between the inner bark and the hard wood or duramen; sapwood.

The portions which are obstructed constitute the duramen or heartwood, the pervious portion the alburnum or sapwood.

It is really imperfect wood, while the duramen or heartwood is the perfect wood; the heartwood of the mature tree was the sapwood of its earlier years.

The wood of the tree, in comparison with the bark, is relatively poor in silex, the duramen of an old tree giving only 2.5 per cent of silex.

See cruel. heart-shaped, a. cordate, cordiform. heartwood, n. duramen. hearty, a. cordial, heartfelt, sincere; healthy, robust, hale; nourishing, nutritious. heat, n. warmth, caloric; cauma.