pith ray

American  

noun

1. medullary ray.

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Etymology

Origin of pith ray

First recorded in 1900–05

Example Sentences

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

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

The vertical tubes are wood fibres, in this case all "tracheids." m, medullary or pith ray; n, transverse tracheids of ray; a, b, and c, bordered pits of the tracheids, more enlarged.

From Seasoning of Wood by Wagner, J. B. (Joseph Bernard)

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

From Wood and Forest by Noyes, William

CS, cross-section; RS, radial section; TS, tangential section; mr, medullary or pith ray; a, height; b, width; and e, length of pith ray.

From Seasoning of Wood by Wagner, J. B. (Joseph Bernard)