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Comprehensive
Dictionary Suite
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alburnum the soft wood between the bark and the heartwood of a tree; sapwood.
duramen the hard, dead wood in the center of certain trees; heartwood.
logwood a tropical American tree that has a hard brownish red heartwood, thorny branches, and yellow flowers. [2 definitions]
sapwood the newer, softer layers of wood, between the bark and the heartwood, that conduct water and sap in a tree.