Medullary Ray

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Related to Medullary rays: macula densa, renal column

medullary ray

[me′dəl·ə·rē ‚rā]
An extension of pith between vascular bundles in the plant stem. Also known as pith ray.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Medullary Ray


a single or polystichous layer of parenchymal cells that intersect the lignin and bast of stems and roots of dicotyledonous plants. Medullary rays serve a storage function and transport matter in a horizontal direction.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

medullary ray, pith ray

medullary rays
In a cross section of a tree or log, one of the ribbons of tissue extending radially from the pith; may vary from microscopic to 4 in. (10 cm) or more in oak; used to store and transport food horizontally within the tree.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
"Those species, also known as lacewood, are noted for their large medullary rays and a silvery grain on the radial surface, which is generally why people like them." Gilmer said though, that getting the species in the United States has been difficult.
The Limousin oak was characterized by the high content of ellagitannins and ellagic acids--no doubt resulting from the high proportion of summer wood and the numerous medullary rays. Limousin oak also contained high levels of hmf, although this compound seems unlikely to influence flavor in itself, in view of its high sensory threshold (Sefton, 1991, Chatonnet, et al.
White oak has a beautiful tan color, it is water resistant, it steam bends beautifully and when quarter sawn, and it has a wonderful pattern with the flake of the medullary rays."
"You get a flake look because of the medullary rays of the wood that is very attractive.