Etymon
enm-ficcioun-english-fiction-protoindoeuropean-deyk-protoindoeuropean-deyketi-protoitalic-deiko-classical-latin-dico-classical-latin-tio-classical-latin-dictio-protoindoeuropean-yosder
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.