(of a sword etc) to unsheath

myelin sheath (membrane surrounding axon of nerve cell)

(anatomy) tendon sheath

(botany) leaf sheath

A marine invertebrate filter feeder of the class Ascidiacea, commonly known as a sea squirt.

coleoptile, protective sheath covering an emerging shoot (botany)

Coleoptera (insect order including beetles)

elytrum (hardened forewing of a beetle, encasing the flight wing)

(invertebrate zoology) ootheca