Sĭl'ver-grāin, n.
n. (Bot.) The lines or narrow plates of cellular tissue, which, in an horizontal section of the trunk of a tree, may be seen radiating from the central pith to the bark; the medullary rays. Gray.
n. (Bot.) The lines or narrow plates of cellular tissue, which, in an horizontal section of the trunk of a tree, may be seen radiating from the central pith to the bark; the medullary rays. Gray.