yolk sac

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noun Embryology.

an extraembryonic membrane that encloses the yolk of eggs in birds, reptiles, and marsupials and that circulates nourishment from the yolk to the developing embryo.

a similar membrane in placental mammals that encloses a mostly hollow space and loses its nutritive function entirely as the placenta develops.

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Origin of yolk sac

First recorded in 1860–65

Words nearby yolk sac

Yokozuna, Yokuts, Yolande, yoldring, yolk, yolk sac, yolk stalk, YOLO, Yom Kippur, Yom Kippur War, yomp

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use yolk sac in a sentence

Surrounded by inert goods, we felt hemmed in, pushed toward a lifestyle cul-de-sac.
How Young People Are Destroying Liberty|James Poulos|October 11, 2014|DAILY BEAST
Separate egg yolk and whites, add chocolate powder to egg whites and whisk.
Epic Meal Empire’s Meat Monstrosities: From the Bacon Spider to the Cinnabattleship|Harley Morenstein|July 26, 2014|DAILY BEAST
Meanwhile, in lower Manhattan, former SAC Capital manager Matthew Martoma is on trial for insider trading in drug-company stocks.
Confide Is the Best Way to Keep Your Dastardly Deeds Hidden—For Now|Daniel Gross|January 17, 2014|DAILY BEAST
As part of the deal, Cohen and SAC Capital had to plead guilty to the charges, and had to accept a further monetary punishment.
That’ll Be $1.2 Billion, Please|Daniel Gross|November 4, 2013|DAILY BEAST

Cohen and SAC in March agreed to pay a $616 million fine to settle insider-trading charges.
That’ll Be $1.2 Billion, Please|Daniel Gross|November 4, 2013|DAILY BEAST
The yolk will cook hard, but the longer you boil the egg the softer the white becomes.
Famous Adventures And Prison Escapes of the Civil War|Various
Stir into it half a wineglassful of brandy and an egg, the white and yolk beaten to a froth.
Dressed Game and Poultry la Mode|Harriet A. de Salis
The case abounded in these culs-de-sac which seemed to lead nowhere.
The Daffodil Mystery|Edgar Wallace
He feared that he would either be shot or left to starve in this cul-de-sac in the hills.
Hidden Gold|Wilder Anthony
It was not the kind of cul-de-sac that Goritz would have chosen.
The Secret Witness|George Gibbs

British Dictionary definitions for yolk sac

yolk sac

noun zoology

the membranous sac that is attached to the ventral surface of the embryos of birds, reptiles, and some fishes and contains yolk

the corresponding part in the embryo of mammals, which contains no yolk

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for yolk sac

yolk sac

A sac that is attached to the gut of an embryo and encloses the yolk in bony fish, sharks, reptiles, mammals, and birds. In most mammals, the yolk sac functions as part of the embryo's circulatory system before the placenta develops.