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adjective Embryology.
  1. isolated from the environment, as certain eggs enclosed within a shell or membrane.

Origin of cleidoic

1930–35; < Greek kleido(ûn) to lock up (verbal derivative of kleís (genitive kleidós) bolt, key) + -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
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