Etymon
en-academic-protoindoeuropean-de-protoindoeuropean-h1-protoindoeuropean-deh1-protoitalic-de-vulgar-latin-de-vulgar-latin-de-protoindoeuropean-men-protoindoeuropean-tis-protoindoeuropean-mentis-protoitalic-mentis-vulgar-latin-mens-vulgar-latin-demens-protoindoeuropean-h2-protoindoeuropean-eh2-protoindoeuropean-yeti-protoindoeuropean-eh2yeti-protoitalic-ao-vulgar-latin-o-vulgar-latin-dementoder
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.