Medullary rays

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Related to Medullary rays: macula densa, renal column
(Bot.) the rays of cellular tissue seen in a transverse section of exogenous wood, which pass from the pith to the bark.

See also: Medullary

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The cooperage reports it spent three years developing a system to handle medullary rays in the branches while sawing the wood.
However, in the most severe models damage may extend outwards to the outer stripe and medullary rays and inwards into the papilla, involving S3 segments of the proximal tubules, as well as thin limbs, and collecting ducts, respectively.
"With its conspicuous, lustrous medullary rays, the radial or quartersawn surface gives you the best bang for your buck," he said.