Google gives me "late Middle English: from Old French ethimologie, via Latin from Greek etumologia, from etumologos ‘student of etymology,’ from etumon, neuter singular of etumos ‘true.’". It doesn't give the fancy tree diagram though.
Yes, I was under the impression the graph was the feature. The textual description of the etymology, I thought, was already often an included part of the snippet.
https://www.google.com/search?q=etymology+etymology
:(