the.com/sheath

a hug shaped exactly like the blade it's terrified of touching wrong.

means A close-fitting cover or case, especially one for the blade of a knife or sword, or by extension a snugly fitting garment or protective tube.

from From Old English 'scēath,' going back to a Germanic root tied to the idea of splitting or separating — cousin to words in Dutch ('schede') and German ('Scheide'). The thread of meaning runs through 'something split off' to 'the thing that holds a split blade,' though the exact path is shadowy. The verb 'to sheathe' (put away the sword) grew from the noun, which is why we still 'sheathe our claws.'

word origin
From Old English meaning to split or separate
biology too
Nerves wear myelin sheaths to fire faster
plant world
Grass blades sprout from protective leaf sheaths
sword secret
A good scabbard keeps the edge dry and rust-free
for instance

damascus steel sheath — ornamental scabbard for curved blades, historically made in damascus with layered steel patterns

kydex sheath — modern tactical holster material used by military and law enforcement since the 1970s

myelin sheath — insulating layer around nerve fibers in the brain and spinal cord that enables neural signaling

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