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| yolk [ yōk ] (plural yolks) |
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1. yellow of egg: the round yellow portion of a bird's or reptile's egg, containing protein and fats that provide nourishment for the developing young. The eggs of mammals, whose embryos absorb nutrients from the mother, contain very little yolk.
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2. oily substance in wool: a greasy substance from the skin of sheep that collects in wool
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| [ Old English geol(o)ca< geolu (see yellow)] |
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 yolk·y adjective |
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