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.’
, bespoke, bloke, broke, choke, cloak, Coke, convoke, croak, evoke, folk, invoke, joke, Koch, moke, oak, okey-doke, poke, provoke, revoke, roque, smoke, soak, soke, spoke, stoke, stony-broke (US
stone-broke), stroke, toke, toque, woke, yoke, yolk
•Holyoake • artichoke • gentlefolk
•menfolk • kinsfolk • womenfolk
•townsfolk • fisherfolk • holmoak
•woodsmoke • cowpoke • slowpoke
•backstroke • breaststroke • keystroke
•heatstroke • sidestroke • downstroke
•sunstroke • upstroke • masterstroke
•counterstroke • equivoque
Material, consisting of a mixture of lipids
, secreted in the form of granules, that in eggs act as a source of food for the growth and development of an embryo.
The food stored in an egg for the use of the embryo. It can consist mainly of protein (protein yolk
) or of phospholipids and fats (fatty yolk
). The eggs of oviparous animals (e.g. birds) contain a relatively large yolk.
greasy substance of sheep's skin glands. XVII. repr. OE. *eowoca
, in the adj. eowociġ
; see -Y1
Rich substance found in the eggs or ova of most animals except those of placental mammals. It consists of fats and proteins and serves as a store of food for the developing embryo.