en·sheathe transitive verb alsoen·sheathorin·sheatheorin·sheath\ə̇n, en+\ Etymology:en- (I)or in- (II) + sheathe or sheath : to cover with or as if with or enclose in or as if in a sheath < bud scales ensheathing the growing point > < the bony core is ensheathed by horny tissue >