The Collaborative International Dictionary of English v.0.48:

Bookcase \Book"case`\, n.
   A case with shelves for holding books, esp. one with glazed
   doors.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bookcase
    n 1: a piece of furniture with shelves for storing books

Moby Thesaurus II by Grady Ward, 1.0:

122 Moby Thesaurus words for "bookcase":
   Smyth sewing, archives, armory, arsenal, attic, backing, bank,
   basement, bay, bibliopegy, bin, binder board, binding,
   bonded warehouse, book cloth, book cover, book end, book jacket,
   book support, book table, book tray, book truck, bookbinding,
   bookholder, bookrack, bookrest, bookshelf, bookstack, bookstand,
   box, bunker, buttery, cargo dock, case, casemaking, casing-in,
   cellar, chest, closet, collating, collating mark, conservatory,
   cover, crate, crib, cupboard, depository, depot, dock, drawer,
   dump, dust cover, dust jacket, exchequer, folder, folding, folio,
   footband, gathering, glory hole, gluing-off, godown, hard binding,
   headband, hold, hutch, jacket, library, library binding, lining,
   lining-up, locker, lumber room, lumberyard, magasin, magazine,
   mechanical binding, niggerhead, perfect binding, plastic binding,
   portfolio, rack, repertory, repository, reservoir,
   revolving bookcase, rick, rounding, saddle stitching, sewing,
   shelf, side sewing, signature, slipcase, slipcover, smashing,
   soft binding, spiral binding, stack, stack room, stamping,
   stapling, stock room, storage, store, storehouse, storeroom,
   supply base, supply depot, tailband, tank, tipping, treasure house,
   treasure room, treasury, trimming, vat, vault, warehouse,
   wine cellar, wire stitching, wrapper