- the yellow and principal substance of an egg, as distinguished from the white.
- the part of the contents of the egg of an animal that enters directly into the formation of the embryo, together with any material that nourishes the embryo during its formation.
- the essential part; the inner core.
- a natural grease exuded from the skin of sheep.
- the substance in an animal ovum consisting of protein and fat that nourishes the developing embryo
- a greasy substance secreted by the skin of a sheep and present in the fleece
