[a. L. alburnum, f. alb-us white.] The whiter, softer, and more recently formed wood in exogenous trees, between the bark and heart-wood; the sap-wood.
1664. Evelyn, Silva (1776), 524. That whiter, softer, fatty part called by the antients Alburnum.
1791. E. Darwin, Bot. Gard., I. 96. Sap-wood or alburnum.
1809. Nat. Hist., in Ann. Reg., 793/1. The buds of trees invariably spring from their Alburnum.
1872. Macmillan, True Vine, iii. 121. The branch, in its most vital part, must come into closest contact with the vine in its most vital part,… the two alburnums and the two libers.
