The American HeritageĀ® Dictionary of the English Language, 4th Edition
n. The newly formed outer wood located just inside the vascular cambium of a tree trunk and active in the conduction of water. Sapwood is usually lighter in color than heartwood.
n. The wood just under the bark of a stem or branch, different in color from the heartwood
the GNU version of the Collaborative International Dictionary of English
n. The alburnum, or part of the wood of any exogenous tree next to the bark, being that portion of the tree through which the sap flows most freely; -- distinguished from heartwood.
The Century Dictionary and Cyclopedia
n. Alburnum.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. newly formed outer wood lying between the cambium and the heartwood of a tree or woody plant; usually light colored; active in water conduction
Word Usage
"The sapwood is probably removed within 100-200 years of study. ..sapwood is outer 20-150 avg 75 ringsā¦."