vitelline adjective. [vɪ'tɛlʌɪn, vʌɪ-, -lɪn] LME.
[medieval Latin vitellinus, from VITELLUS: see -INE¹.]
1. Of a deep yellow colour like the yolk of an egg. Now rare. LME.

2. Zoology & Embryology. Of or belonging to the yolk of an egg or embryo; designating embryologically related structures in mammals in which the yolk-sac is rudimentary. M19.
vitelline duct a duct which conveys yolk from the yolk gland to the oviduct. vitelline gland a yolk-secreting gland present in many invertebrates. vitelline layer, vitelline membrane a transparent membrane surrounding and secreted by the ovum, and freq. surrounding the yolk.

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