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Noun: vitellus (vitelli)  vi'te-lus
  1. Nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg)
    "The chick embryo relied on the vitellus for nourishment during its development";
    - yolk

Derived forms: vitelli

Type of: food, nutrient

Part of: egg

Encyclopedia: Vitellus