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[mass noun] The process of shedding the old skin (in reptiles) or casting off the outer cuticle (in insects and other arthropods).
- ‘During terminal pleateau there are a series of large pulses of circulating ecdysteroids which appear to be necessary for successful ecdysis of the entire exoskeleton.’
- ‘At ecdysis, the animal sheds the old exoskeleton while absorbing large quantities of water to stretch the new exoskeleton.’
- ‘Upon ecdysis, a chitinous duplicature of the exoskeleton is shed and a growth band is added to the valves.’
- ‘In both groups, tissue loss must occur before a critical period to permit regeneration before the next ecdysis and proecdysial processes are suspended during regeneration in order to maintain proper timing of events.’
- ‘Considering Crustacea as an analogy, abnormal secretion of exuviation hormones in trilobite exoskeletons could also have caused irregular ecdysis and given rise to aberrant exoskeletal morphology.’
Mid 19th century: from Greek ekdusis, from ekduein put off, from ek- out, off + duein put.
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