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Lengua inglesa
yolk
noun
1 in the eggs of birds and some reptiles: the yellow spherical mass of nutritive material.
2 cookery , etc this yellow part of an egg, as distinct from the white ( noun 4). Also called egg-yolk, yolk of egg.
[Anglo-Saxon geolca , from geolu yellow]


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yolk sac
noun , zool the yolk-containing sac that is attached to the embryo by the yolk-stalk, a short stalk by means of which nutrients from the yolk may pass into the alimentary canal of the embryo.


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