Definition of yolk noun from the Oxford Advanced Learner's Dictionary

 

yolk

 noun
noun
BrE BrE//jəʊk//
 
; NAmE NAmE//joʊk//
 
[countable, uncountable]
 
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the round yellow part in the middle of an egg Separate the whites from the yolks. More Like This Silent letters gnarled, gnash, gnat, gnaw, gnome haute cuisine, heir, (NAmE herb), honour, hors d’oeuvre, hour knack, knee, kneel, knife, knight, knit, knob, knock, knot, know, knuckle psalm, psephology, psychic, ptarmigan, pterodactyl, psychology wrangle, wrap, wreath, wreck, wrench, wrestle, wriggle, wring, write, wrong bomb, climb, crumb, doubt, lamb, limb ascent, fascinate, muscle, scene, scissors height, right, sleigh, weight align, campaign, design, foreign, malign, reign, unfeigned balmy, calm, calf, half, yolk autumn, column, condemn, damn, hymn, solemn bristle, fasten, listen, mortgage, soften, thistle, wrestle biscuit, build, circuit, disguise, guilty, league, rogue, vague yacht answer, sword, twoSee worksheet. Word Origin Old English geol(o)ca, from geolu ‘yellow’.Extra examples Combine the egg yolks with the milk. Separate the yolks and/​from the whites. Stir in the yolks of two eggs.
See the Oxford Advanced American Dictionary entry: yolk