Dictionary.net

• A fetal vessel which connects the umbilical vein and the vena cava ascendens.

1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland

• The smaller, shorter, and posterior of the two branches into which the umbilical vein divides after entering the abdomen; it joins the left hepatic vein.

1916 - Appleton's medical dictionary
By Smith Ely Jelliffe