from The Century Dictionary.
- noun In botany, the central wood or heart-wood in the trunk of an exogenous tree.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Bot.) The heartwood of an exogenous tree.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun botany
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
It lies next the bark, and after a course of years, sometimes many, as in the case of oaks, sometimes few, as in the case of firs, it becomes hardened and ultimately forms the duramen or heartwood.
The duramen or heartwood is the inner, darker part of the log.
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.
Wood is composed of duramen or heartwood, and alburnum or sapwood, and when dry consists approximately of 49 per cent by weight of carbon, 6 per cent of hydrogen, 44 per cent of oxygen, and 1 per cent of ash, which is fairly uniform for all species.
-- The logwood of commerce is the red heart wood, or duramen, of a fine lofty growing tree (_Haematroxylon Campechianum_), growing in Campeachy and the bay of Honduras, and which is also now common in the woods of Jamaica and St. Domingo.
The Commercial Products of the Vegetable Kingdom Considered in Their Various Uses to Man and in Their Relation to the Arts and Manufactures; Forming a Practical Treatise & Handbook of Reference for the Colonist, Manufacturer, Merchant, and Consumer, on the Cultivation, Preparation for Shipment, and Commercial Value, &c. of the Various Substances Obtained From Trees and Plants, Entering into the Husbandry of Tropical and Sub-tropical Regions, &c.
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.
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In the Fagus sylvestris, white beech, "the duramen or perfect wood, bears a remarkably small proportion to its alburnum.
Resources of the Southern Fields and Forests, Medical, Economical, and Agricultural. Being also a Medical Botany of the Confederate States; with Practical Information on the Useful Properties of the Trees, Plants, and Shrubs