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

Word History and Origins

Origin of medullary ray¹

First recorded in 1820–30