Avitchi (Sk.) A state: not necessarily after death only or between two births, for it can take place on earth as well. Lit., “uninterrupted hell”. The last of the eight hells, we are told, “where the culprits die and are reborn without interruption—yet not without hope of final redemption. This is because Avitchi is another name for Myalba (our earth) and also a state to which some soulless men are condemned on this physical plane.
Source: H.P.Blavatsky - The Theosophical Glossary