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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.

om Brazil and other tropical countries, for cabinet-work, and for dyeing. The best is the heartwood of Cæsalpinia echinata, a leguminous tree; but other trees also yield it. An interior sort comes from Jamaica, the timber of C. Braziliensis and C. crista. This is often distinguished as Braziletto , but the better kind…

The heartwood of an exogenous tree.

The heartwood of a tree (Hæmatoxylon Campechianum), a native of South America, It is a red, heavy wood, containing a crystalline substance called hæmatoxylin, and is used largely in dyeing. An extract from this wood is used in medicine as an astringent. Also called Campeachy wood, and bloodwood.

ee (Colibrina reclinata) of Southern Florida and the West Indies, having a hard and heavy heartwood, which takes a fine polish. C. S. Sargent.

The highly perfumed yellowish heartwood of an East Indian and Polynesian tree (Santalum album), and of several other trees of the same genus, as the Hawaiian Santalum Freycinetianum and S. pyrularium, the Australian S. latifolium, etc. The name is extended to several other kinds of fragrant wood.

g that portion of the tree through which the sap flows most freely; -- distinguished from Heartwood.

-- Tiger wolf (Zoöl.), the spotted hyena (Hyæna crocuta). -- Tiger wood, the variegated heartwood of a tree (Machærium Schomburgkii) found in Guiana.