The Collaborative International Dictionary of English v.0.48:

Pharmacy \Phar"ma*cy\, n. [OE. fermacie, OF. farmacie,
   pharmacie, F. pharmacie, Gr. farmakei`a, fr. farmakey`ein to
   administer or use medicines, fr. fa`rmakon medicine.]
   1. The art or practice of preparing and preserving drugs, and
      of compounding and dispensing medicines according to
      prescriptions of physicians; the occupation of an
      apothecary or a pharmaceutical chemist.
      [1913 Webster]

   2. A place where medicines are compounded; a drug store; an
      apothecary's shop.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pharmacy
    n 1: the art and science of preparing and dispensing drugs and
         medicines, [syn: pharmacy, pharmaceutics]
    2: a retail shop where medicine and other articles are sold
       [syn: drugstore, apothecary's shop, chemist's,
       chemist's shop, pharmacy]

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "pharmacy":
   X ray, antique store, apothecary, automobile showroom, blood bank,
   bookstore, bootery, candy store, charity ward, chemist,
   cigar store, clinic, clothiers, clothing store, confectionery,
   consultation room, delivery room, dispensary, dispensatory,
   dress shop, drugstore, dry goods store, emergency, examining room,
   fever ward, florists, fur salon, furniture store, gift shop,
   haberdashery, hardware store, hat shop, hobby shop, hospital room,
   intensive care, ironmongery, isolation, jewelers, jewelry store,
   labor room, laboratory, leather goods store, liquor store,
   luggage shop, materia medica, maternity ward, milliners,
   novelty shop, nursery, operating room, package store,
   pharmaceutics, pharmacology, pharmacopoeia, posology, prison ward,
   private room, recovery room, saddlery, schlock house, schlock shop,
   secondhand shop, secondhand store, semi-private room, shoe store,
   smoke shop, specialty shop, sporting goods store, stationers,
   stationery store, surgery, sweater shop, sweet shop, therapy,
   thrift shop, tobacco store, tobacconists, toy shop, treatment room,
   trimming store, used-car lot, ward