Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The sac in which the foetus develops in mammals, reptiles and birds.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)

Etymologies

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Examples

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