yolk

yolk

noun

{bc}the yellow spheroidal mass of stored food that forms the inner portion of the egg of a bird or reptile and is surrounded by the white {dx}see {dxt|egg|egg|illustration}{/dx}

yoke

noun

{bc}a wooden bar or frame by which two draft animals (such as oxen) are joined at the heads or necks for working together

yolk sac

noun

{bc}a membranous sac of most vertebrates that encloses the yolk, is attached in most forms (as in humans) through the yolk stalk with the intestinal cavity of the embryo, and is supplied with blood vessels that transport nutritive yolk products to the developing embryo

yolk stalk

noun

{bc}the narrow tubular stalk connecting the yolk sac with the embryo