YOLK

also yoke noun see: yellow Date: before 12th century 1. 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, the whole contents of an animal ovum consisting of a protoplasmic formative portion and an inert nutritive portion, material stored in an animal ovum that supplies food to the developing embryo and consists chiefly of proteins, lecithin, and cholesterol, oily material in unprocessed sheep wool consisting of wool fat, suint, and debris, ~ed adjective ~y adjective