noun, plural vi·tel·lus·es.
Origin of vitellus
Examples from the Web for vitellus
It has only been met with in the vitellus of some of the medium sized ova of a young female.
This vitellus or yolk undergoes a series of segmentation or dividings which are known as spontaneous segmentation.What a Young Husband Ought to Know|Sylvanus Stall
In Ascidia canina these processes become as long as the whole diameter of the vitellus (Kupffer, No. 60).The Works of Francis Maitland Balfour, Volume II (of 4)|Francis Maitland Balfour
It is formed from the vitellus at a much later period than the proper vitelline membrane.
Vitellus abdicated the Roman empire, which "he had received against his will."The Every Day Book of History and Chronology|Joel Munsell