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medullary ray

noun

, Botany.
  1. (in the stems of woody plants) one of the vertical bands or plates of unspecialized tissue that radiate between the pith and the bark.


medullary ray

noun

  1. any of the sheets of conducting tissue that run radially through the vascular tissue of some higher plants
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of medullary ray1

First recorded in 1820–30
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Example Sentences

In many of these cases the dying-back of the twigs is expedited owing to the mycelium invading the medullary rays and wood vessels, and so obstructing the transpiration current.

It is also traversed by medullary rays, Mr, which are continuations of those in the wood.

The medullary rays usually consist of a single tier of cells, but in the Pinus type of wood broader medullary rays also occur and are traversed by horizontal resin-canals.

A longitudinal section made from bark to centre, as when a log is "quarter-sawed," shows a full side view of the "medullary rays."

MR, medullary rays, lines between the bundles connecting the pith and the cortex.

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medullarymedullary sheath