Etymon
pie-eyos-protoitalic-ejos-protoitalic-eos-latin-eus-latin-alveus-protoindoeuropean-los-protoindoeuropean-elos-protoitalic-elos-latin-ulus-latin-olus-latin-alveolusbor
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.