The Collaborative International Dictionary of English v.0.48:

Sheol \She"ol\ (sh[=e]"[=o]l), n. [Heb. sh[e^][=o]l.]
   The place of departed spirits; Hades; also, the grave.
   [1913 Webster]

         For thou wilt not leave my soul to sheol. --Ps. xvi.
                                                  10. (Rev.
                                                  Ver.)
   [1913 Webster]

Easton's 1897 Bible Dictionary:

Sheol
   (Heb., "the all-demanding world" = Gr. Hades, "the unknown
   region"), the invisible world of departed souls. (See HELL.)