abysm

from WordNet (r) 3.0 (2006)

abysm
    n 1: a bottomless gulf or pit; any unfathomable (or apparently
         unfathomable) cavity or chasm or void extending below
         (often used figuratively) [syn: {abyss}, {abysm}]

from The Collaborative International Dictionary of English v.0.48

Abysm \A*bysm"\, n. [OF. abisme; F. abime, LL. abyssimus, a
   superl. of L. abyssus; Gr. ?. See {Abyss}.]
   An abyss; a gulf. "The abysm of hell." --Shak.
   [1913 Webster]

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