Added 6 October 2026 mephistopheles noun Categories: PeopleRare Words noun ! Definition from WordNet 3.1, Princeton University. More about mephistopheles at Wordnik → Where our words come from → Evil spirit to whom Faust sold his soul. Related Words: faustmephistobelphegorluciferbeelzebubmemnochasmodeusdevilastarothfiend Back to today's word