| Word | Definitions | Synonyms |
|---|---|---|
| vitellarium | (noun) A modified part of the ovary that in many flatworms and rotifers produces yolk-filled cells serving to nourish the true eggs. | - |
| vitellus | (noun) nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg) | Synonyms: yolk |