Etymon
itc-anos-latin-anus-protoindoeuropean-los-protoindoeuropean-elos-protoitalic-elos-latin-ulus-latin-anulus-protoindoeuropean-h2-protoindoeuropean-eh2-protoindoeuropean-tos-protoindoeuropean-eh2tos-protoitalic-atos-latin-atus-latin-anulatus-latin-annulatus-protoindoeuropean-tis-protoindoeuropean-ho-protoindoeuropean-tiho-protoitalic-tio-latin-tio-latin-atiolbor
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.