Definition of yolk in English:


Line breaks: yolk
Pronunciation: /jəʊk


  • 1The 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: two yolks [mass noun]: a mass of yolk
    More example sentences
    • These new noodles substitute soy flour for semolina flour and may contain egg whites or yolks to boost protein.
    • Whole egg protein contains yolks and whites, providing a high ratio of indispensable amino acids.
    • Fold the egg whites into the egg yolk and sugar mixture.
  • 1.1 [mass noun] Zoology The part corresponding to the yolk in the ovum or larva of all egg-laying vertebrates and many invertebrates.
    More example sentences
    • In contrast to the fluid yolk of atherinomorphs, yolk is organized into globules in other taxa.
    • An estimate of the daily amount of yolk deposited on developing ova and the sequence of laying are important when evaluating the total cost of egg production.
    • In this study, we investigated differences in maternally deposited yolk testosterone and DHT in relation to diet quality.



More example sentences
  • Females are ovoviviparous, retaining yolked embryos without nourishing them.
  • This effect is most pronounced in the heavily yolked eggs of birds and zebrafish.
  • But while Lincoln and Washington are yolked in the generic President's Day holiday, King has that third Monday of January to himself.


More example sentences
  • The mean diameter for yolkless egg ranges from below 40 mm to above 55 mm.
  • A harness with a satellite transmitter was applied after she finished laying 88 eggs and 20 yolkless eggs.
  • It was my turn to catch the eggs. 69 yolked and 67 yolkless, a somewhat unusual proportion.


adjective (yolkier, yolkiest)
More example sentences
  • Female hagfish produce between 20 and 30 yolky, shelled eggs at a time.


Old English geol(o)ca, from geolu 'yellow'.

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