medullary sheath

De la Renta did design some stuff for Kennedy too—notably, one perfect belted sheath in crisp white linen.
How Oscar de la Renta Created First Lady Fashion|Raquel Laneri|October 21, 2014|DAILY BEAST
Finally, she slithered into a finished dress: the ultimate chic sheath, a collarless long-sleeved navy blue garment.
Tilda Swinton and Oliver Saillard Perform the Creation of Fashion in ‘Eternity Dress’|Sarah Moroz|November 21, 2013|DAILY BEAST
And she has been spotted wearing nothing but the most discrete, tailored sheath dresses.
Petraeus Affair Stereotypes: The General, The Flirt And The Harlot|Robin Givhan|November 15, 2012|DAILY BEAST
The first lady wore a Michael Kors sheath with a matching cropped jacket and traditional pearls.
Michelle Obama and Ann Romney: First Ladies of Style|Robin Givhan|October 24, 2012|DAILY BEAST

The brightly colored sheath was a form of political détente and self-definition.
Michelle Obama’s First-Lady Fashion: Subtle and Savvy|Robin Givhan|September 4, 2012|DAILY BEAST
The Datto complaisantly allowed me to draw it from the sheath and pass it round to my friends.
The Philippine Islands|John Foreman
Whipping the long, keen blade from its sheath, Marius bore down upon the rash meddler.
St. Martin's Summer|Rafael Sabatini
Tail truncated, spine on the side of the tail very distinct, imbedded in a sheath.
Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]|Phillip Parker King
He saw a large sheath-knife, and secured that in his own belt; then he took a mouthful of wine, and went to his post.
The Chequers|James Runciman
He was trying to 286 work the knife from its sheath before I could force him backward or break his neck.
A Virginia Scout|Hugh Pendexter

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

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for medullary sheath

medullary sheath

myelin sheath