pith ray

American  

noun

1. medullary ray.

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Etymology

Origin of pith ray

First recorded in 1900–05

Example Sentences

A pith ray shrinks in height and width, that is, vertically and tangentially as applied to the position in a standing tree, but very little in length or radially.

From The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing by Record, Samuel J.

Microscopically the white pine can be distinguished by having usually only one large pit, while spruce shows three to five very small pits in the parenchyma cells of the pith ray communicating with the tracheid.

From Wood and Forest by Noyes, William

Three to six small pits on the radial walls of each cell of the pith ray.

From Wood and Forest by Noyes, William

Walls of tracheids of pith ray smooth, without dentate projections. a.

From Wood and Forest by Noyes, William

P, pith; PB, primary bast; SB, secondary bast; C, cambium; PR, pith ray; PW, primary wood; SW, secondary wood; PS, procambium strands.

From Wood and Forest by Noyes, William