Etymon
pie-wos-protoitalic-wos-latin-uus-latin-ambiguus-protoindoeuropean-teh2-protoindoeuropean-ts-protoindoeuropean-teh2ts-protoitalic-tats-latin-tas-latin-ambiguitasder
A dedicated page for this root is on the way — it will gather every word descended from it, sibling forms across daughter languages, and a branching map of the family tree.