Allantois is a 9 letter English word. It's valid Words with friends word worth 12 points.
You can make 417 anagrams from letters in allantois (aaillnost).
1640-50; New Latin Greek allantoeidḗs, wrongly taken for plural and given a singular, on the model of words like hērōís (singular), hērōídes (plural)
Immediately after hatching the yolk-sack becomes withdrawn into the body; while the external part of the allantois shrivels up.
As the allantois increases in size and importance, the allantoic vessels are correspondingly developed.
The allantois (al) is a simple vascular sack with a large cavity.
It thus comes about that the further splitting of the mesoblast merely enlarges the cavity in which the allantois lies.
The cavity of the allantois, if developed, vanishes completely.
Similar movements are also seen in the allantois at a considerably later period.
The function of the allantois is still in a great measure unknown.
The cavity of the allantois, by means of its stalk passing through the umbilicus, is of course continuous with the cloaca.
So the allantois of the reptile has become the placenta of the mammal.
The allantois was quite free and not attached to the subzonal membrane.