yolk

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yolk / yōk/ • n. the yellow internal part of a bird's egg, which is surrounded by the white, is rich in protein and fat, and nourishes the developing embryo. ∎  Zool. the corresponding part in the ovum or larva of all egg-laying vertebrates and many invertebrates.ORIGIN: Old English geol(o)ca, from geolu ‘yellow.’

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