The Collaborative International Dictionary of English v.0.48:

Tome \Tome\ (t[=o]m), n. [F. tome (cf. It., Sp., & Pg. tomo), L.
   tomus, fr. Gr. ? a piece cut off, a part of a book, a volume,
   akin to ? to cup, and perhaps to L. tondere to shear, E.
   tonsure. Cf. Anatomy, Atom, Entomology, Epitome. ]
   As many writings as are bound in a volume, forming part of a
   larger work; a book; -- usually applied to a ponderous
   volume.
   [1913 Webster]

         Tomes of fable and of dream.             --Cowper.
   [1913 Webster]

         A more childish expedient than that to which he now
         resorted is not to be found in all the tomes of the
         casuists.                                --Macaulay.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "tome":
   best seller, book, bound book, classic, coloring book,
   definitive work, folio, great work, hardback, juvenile,
   juvenile book, limp-cover book, magnum opus, nonbook, notebook,
   novel, opus, opuscule, opusculum, paperback, picture book,
   playbook, pocket book, prayer book, production, psalmbook, psalter,
   publication, serial, sketchbook, soft-cover, songbook,
   standard work, storybook, title, trade book, volume, work,
   writing