The base of a leaf when sheathing or investing a stem or branch, as in grasses.
One of the elytra of an insect.
Verbit
To put an object (especially a weapon, in particular, a sword) into its sheath.
Esimerkit
But when his foe lies prostrate on the plain, / He sheaths his paws, uncurls his angry mane, / And pleased with bloodless honours of the day, / Walks over and disdains th' inglorious prey.
[…] dans la matière blanche, la principale barrière est la gaine de myéline des axones.