sapwood

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Related to Alburnum: duramen

sapwood

(săp′wo͝od′)
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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

sapwood

the ring of living XYLEM tissue in a stem or root which has undergone SECONDARY THICKENING, and which is composed of VESSELS and PARENCHYMA cells. Sapwood lies outside the HEARTWOOD but inside the ring of PHLOEM.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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