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yolk (yok, yolk)
1. One of the types of nutritive material stored in the ovum for the nutrition of the embryo; y. is particularly abundant and conspicuous in the eggs of birds.vitellus; 2. Fatty material found in the wool of sheep; when extracted and purified, it becomes lanolin. [A.S. geolca; geolu, yellow]
white y. y. consisting of much finer particles than those of yellow y.; thin layers of it lie between the zones of yellow y. and form the latebra.
yellow y. the chief constituent of the y. in a bird's egg; it consists of relatively coarse particles of stored food materials and is laid down in concentric zones with interposed thin layers of white y.
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