medullary ray

noun, Botany

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

Also called pith ray.

Origin

1820-30

Examples from the web for medullary ray

Tuber symptoms include mild vascular discoloration and brown flecking of medullary ray.

British Dictionary definitions for medullary ray

medullary ray

noun

any of the sheets of conducting tissue that run radially through the vascular tissue of some higher plants

medullary ray in Medicine

medullary ray n.
The center of the renal, cortical lobule, consisting of the ascending or descending limbs of the nephronic loop or of the collecting tubules. Also called Ferrein's pyramid.