Of or pertaining to the vitellus, or yolk of an egg; forming a vitellus, as protoplasm: said especially of the large mass of food-yolk or deutoplasm of a meroblastic egg, or of the vitellicle.In enton. and botany, colored like the yolk of an egg; deep-yellow with a tinge of red.Also vitellary.n. Yolk; the vitellus; the vitellary substance. See I., 1.