antcestor ant-ces-tor noun An ant, typically one more remote than a grandparent, that lives in the family tree and from whom one is descended. SEE ALSO: crocroach, cannybull Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Share on Tumblr (Opens in new window) Tumblr Share on Pinterest (Opens in new window) Pinterest Share on Reddit (Opens in new window) Reddit Email a link to a friend (Opens in new window) Email Like Loading...