Etymon
en-sub-protoindoeuropean-h2ed-protoitalic-ad-protoitalic-ad-latin-ad-protoindoeuropean-gleyh-protoindoeuropean-gloh1ytn-protoitalic-gloiten-latin-gluten-latin-glutino-latin-agglutino-latin-agglutinatuslbor
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.