Erebus Look up Erebus at Dictionary.com
in Homer, etc., the place of darkness between Earth and Hades, from Latin Erebus, from Greek Erebos, of unknown origin, perhaps from Semitic (compare Hebrew erebh "sunset, evening"), or from PIE *regw-es- "darkness" (cognates: Sanskrit rajas "the atmosphere, thick air, mist, darkness;" Gothic rikwis "darkness"). Used figuratively of darkness from 1590s.