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vitellicle

viˈtellicle Biol.
  [f. L. vitell-us vitellus + dim. ending -icle.]
  A vitelline sac; a yolk-sac.

1852 Brande Dict. Sci., etc. (ed. 2) Suppl. s.v., In man and mammalia the vitellicle is called the ‘umbilical vesicle’.

Oxford English Dictionary

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