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silver grain

noun — 2 senses

silver grain

nounalso spelled silver-grain
1

Biology, Botany, Natural sciences The lines or narrow plates of cellular tissue which pass from the pith to the bark of an exogenous stem; the medullary rays. In the wood of the oak they are much larger than in that of the beech, maple, pine, cherry, etc.

silver-grain

noun
1

Biology, Botany, Natural sciences The appearance in radial longitudinal section of exogenous wood, especially oak, due to shining plates of the medullary rays.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — authors: page histories for silver grain and silver-grain.