Etymon
enm-re-english-re-protoindoeuropean-de-protoindoeuropean-h1-protoindoeuropean-deh1-protoitalic-de-latin-de-latin-de-protoindoeuropean-dheh1-protoindoeuropean-dheh1k-protoindoeuropean-yeti-protoindoeuropean-dhh1kyeti-protoitalic-akjo-protoitalic-fakjo-latin-facio-latin-deficio-protoindoeuropean-tus-protoitalic-tus-latin-tus-latin-defectusbor
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.