ec·dy·sis 
(ĕkdĭ-sĭs)
(ĕkdĭ-sĭs)n. pl. ec·dy·ses (-sēz′)
The shedding of an outer integument or layer of skin, as by insects, crustaceans, and snakes; molting.
[Greek ekdusis, a stripping off, from ekduein, to take off : ek-, out, off; see ECTO- + duein, to put on.]