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