- The definition of a yolk is the yellow part of an egg.
An example of a yolk is the part you remove to make an egg white omelet.
An egg yolk nestled in its shell.
- the yellow, principal substance of an egg, as distinguished from the albumen, or white
- Biol. the protein and fat stored in the ovum, serving as nourishment for the growing embryo
Origin of yolkMiddle English yolke ; from Old English geolca, yolk, literally , yellow part, akin to geolu, yellow
- a. The portion of the egg of egg-laying vertebrates, such as reptiles and birds, and of certain invertebrates that consists chiefly of protein and fat and serves as the primary source of nourishment for the early embryo.b. This portion of the egg of a bird, especially a chicken, which is large, yellow, and surrounded by albumen.
- A greasy substance found in unprocessed sheep's wool, which is refined to make lanolin.
Origin of yolkMiddle English yolke, from Old English geolca, from geolu, yellow; see yellow.
From Old English ġeolca, from ġeolu (“yellow”).