Etymon
pie-h1rewdh-protoindoeuropean-os-protoindoeuropean-h1rowdhos-protogermanic-raudaz-protowest-germanic-raud-old-english-read-middle-english-red-english-red-inherited-from-middle-english-red
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.