from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of, relating to, or associated with the yolk of an egg.
- adj. Having the yellow hue of an egg yolk; dull yellow.
- n. The yolk of an egg.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of, pertaining to, or resembling the yolk of an egg
from the GNU version of the Collaborative International Dictionary of English
- adj. Of or pertaining to the yolk of eggs.
from The Century Dictionary and Cyclopedia
- Of or pertaining to the vitellus, or yolk of an egg; forming a vitellus, as protoplasm: said especially of the large mass of food-yolk or deutoplasm of a meroblastic egg, or of the vitellicle.
- In enton. and botany, colored like the yolk of an egg; deep-yellow with a tinge of red.
- Also vitellary.
- n. Yolk; the vitellus; the vitellary substance. See I., 1.
A. Egg of the Dog, with the vitelline membrane burst, so as to give exit to the yolk, the germinal vesicle (a), and its included spot (b).
This egg consists of an outer envelope, the vitelline membrane, containing a fluid more or less dense, the yolk; within this is a second envelope, the so-called germinative vesicle, containing a somewhat different and more transparent fluid, and in the fluid of this second envelope float one or more so-called germinative specks.
The eggs laid by the nitrogenous fed hens were of small size, having a disagreeable flavor and smell, watery albumen, an especially small, dark colored yolk, with a tender vitelline membrane, which turned black after being kept several weeks.
While the eggs of the carbonaceous fed hens were large, of fine flavor, of natural smell, large normal albumen, an especially large, rich yellow yolk, with strong vitelline membrane, which was perfectly preserved after being kept for weeks in the same brine with the other eggs.
Oölemma: the cell wall of an egg: see vitelline membrane.
Included in this tissue are the body-stalk and the vitelline ductthe former containing the allantoic diverticulum and the umbilical vessels, the latter forming the communication between the digestive tube and the yolk-sac.
The remains of the vitelline duct and yolk-sac may be sometimes observed beneath the amnion, close to the cord, the former as an attenuated thread, the latter as a minute sac.
The vitelline vessels and duct, together with the right umbilical vein, undergo atrophy and disappear; and thus the cord, at birth, contains a pair of umbilical arteries and one (the left) umbilical vein.
The lateral leaves of somatopleure then grow round on each side, and, meeting on the ventral aspect of the allantois, enclose the vitelline duct and vessels, together with a part of the extra-embryonic celom; the latter is ultimately obliterated.
With the rapid elongation of the embryo and the formation of the tail fold, the body stalk comes to lie on the ventral surface of the embryo (Figs. 27 and 28), where its mesoderm blends with that of the yolk-sac and the vitelline duct.