medical Definition of round ligament
1
: a fibrous cord resulting from the obliteration of the umbilical vein of the fetus and passing from the navel to the notch in the anterior border of the liver and along the undersurface of that organ
2
: either of a pair of rounded cords arising from each side of the uterus and traceable through the inguinal canal to the tissue of the labia majora into which they merge
