Etymon
pie-is-protoindoeuropean-h1oynos-protoitalic-oinos-old-latin-oinos-latin-unus-latin-uni-protoindoeuropean-h2enh1-protoindoeuropean-mos-protoindoeuropean-h2enh1mos-protoitalic-anamos-latin-animus-latin-unanimusder
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.