Etymon
lat-paene-protoindoeuropean-h2el-protoitalic-tmmos-protoitalic-oltmmos-latin-ultimus-latin-paenultimus-protoindoeuropean-h2-protoindoeuropean-eh2-protoindoeuropean-tos-protoindoeuropean-eh2tos-protoitalic-atos-latin-atuslbor
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.