MEANING: noun: The shedding of an outer layer: molting.

ETYMOLOGY: From Greek ekdysis, from ekdyein (to take off), from ek- (out, off) + dyein (to put on). A related word is ecdysiast. Earliest documented use: 1867.

ECDYSISE - to dress, undress, and redress vigorously, so as to stay physically fit

PECDYSIS - mastectomy

ETC.DYSIS - opening a matryoshka doll set