‖Ec″dy‐sis (?), n.; pl.Ecdyses (#). [NL., fr. Gr. ἔκδυσισ a getting out, fr. εκδὔειν, to put off; εκ̓ out + δύειν to enter.] (Biol.) The act of shedding, or casting off, an outer cuticular layer, as in the case of serpents, lobsters, etc.; a coming out; as, the ecdysis of the pupa from its shell; exuviation.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.