WordNet: case, sheath

an enveloping structure or covering enclosing an animal or plant organ or part

• hypernym cover, covering, natural covering

• hyponym theca

• hyponym lorica

• hyponym medullary sheath, myelin sheath

• hyponym neurilemma, neurolemma

• hyponym husk

case

• (englanti) case (derivationally related)
• (suomi) kotelo (synonyymi)

sheath

• (suomi) tuppi (synonyymi)