Etymon
lat-ab-protoindoeuropean-h1es-protoindoeuropean-h1esmi-protoindoeuropean-bhuh-protoindoeuropean-bhuht-protoitalic-som-ezom-latin-sum-latin-absum-latin-absensder
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.