in genealogy, any person to whom two or more persons claim descent; also, the most recent ancestral form or species from which two different species evolved
We evolved from a common ancestor, and inherited much of the same biochemistry—along with its weaknesses.
At the time, the dingo was semi-domesticated and is believed to be the common ancestor of all breeds today.
No doubt the common ancestor of the above family of vagabonds descended from a family of vagabonds.
At Rome the worship of a common ancestor was the strongest family bond.
They all have the same pedigree, a marked resemblance to each other, and they derive their descent from a common ancestor.
It is interesting that bears, dogs, and seals descended from a common ancestor.
I think this brotherhood may be traced to our common ancestor, Adam, and in this sense all wars are indeed civil wars.
They were named after the common ancestor and occupied by his heirs.
Nor does he establish any relation whatever between any of the four races and any common ancestor or eponymist.
Though our relationship was not close we had been cast in the mold of some common ancestor.