medullary sheath

noun

Botany. a narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants.
Anatomy. myelin sheath.

Origin of medullary sheath

First recorded in 1840–50

Words nearby medullary sheath

medullary groove, medullary membrane, medullary plate, medullary pyramid, medullary ray, medullary sheath, medullary space, medullary sponge kidney, medullary stria of fourth ventricle, medullary stria of thalamus, medullary substance

British Dictionary definitions for medullary sheath

medullary sheath

noun

anatomy a myelin layer surrounding and insulating certain nerve fibres
a layer of thick-walled cells surrounding the pith of the stems of some higher plants

Medical definitions for medullary sheath

medullary sheath

n.

myelin sheath