Etymon
en-o-english-thyro-protoindoeuropean-bheyd-protoindoeuropean-ne-protoindoeuropean-ti-protoindoeuropean-bhinedti-protoitalic-findo-latin-findo-protoindoeuropean-tew-protoindoeuropean-reh2-latin-tura-latin-fissurader
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.