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[al-bur-nuh m] /ælˈbɜr nəm/
noun, Botany
1655-65; < Latin, equivalent to alb(us) white + -urnum neuter noun suffix
Related forms
alburnous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for alburnum


a former name for sapwood
Word Origin
C17: from Latin: sapwood, from albus white
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for alburnum


outer, living layers of the secondary wood of trees, which engage in transport of water and minerals to the crown of the tree. The cells therefore contain more water and lack the deposits of darkly staining chemical substances commonly found in heartwood. Sapwood is thus paler and softer than heartwood and can usually be distinguished in cross sections, as in tree stumps, although the proportions and distinctness of the two types are variable in different species

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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