Etymon
pie-weyh1s-protoitalic-wis-latin-vim-protoindoeuropean-deyk-protoindoeuropean-deyketi-protoitalic-deiko-latin-dicere-protoindoeuropean-s-latin-s-latin-vindex-protoindoeuropean-h2-protoindoeuropean-eh2-protoindoeuropean-yeti-protoindoeuropean-eh2yeti-protoitalic-ao-latin-o-latin-vindicare-old-french-vengier-old-french-avengierbor
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.