involucrum

involūcrum ī, n

3 VOL-, a wrapper, covering, case, envelope : candelabri.—Fig., a cover, mask : simulationum.

involucrum
invŏlūcrum, i, n. [involvo], that in which something is wrapped, a wrapper, covering, case, envelope...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
Involucrum
·noun ·see <<Involucre>>. II. Involucrum ·noun A sheath which surrounds the base of the lasso cells...

Webster's Dictionary of the English Language