Etymon
pie-kw-protoindoeuropean-kwis-protoitalic-kwis-protoindoeuropean-kw-protoindoeuropean-kwos-protoitalic-kwoi-latin-quam-protoindoeuropean-soder
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.