Etymon
en-co-protoindoeuropean-h2ed-protoitalic-ad-protoitalic-ad-latin-ad-latin-haereo-latin-adhaereo-latin-adhaerens-protoindoeuropean-yos-protoitalic-ios-old-latin-ios-latin-ius-latin-ia-medieval-latin-adhaerentiader
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.