The Collaborative International Dictionary of English v.0.48:

Butler \But"ler\ (b[u^]t"l[~e]r), n. [OE. boteler, F.
   bouteillier a bottle-bearer, a cupbearer, fr. LL.
   buticularius, fr. buticula bottle. See Bottle a hollow
   vessel.]
   An officer in a king's or a nobleman's household, whose
   principal business it is to take charge of the liquors,
   plate, etc.; the head servant in a large house.
   [1913 Webster]

         The butler and the baker of the king of Egypt. --Gen.
                                                  xl. 5.
   [1913 Webster]

         Your wine locked up, your butler strolled abroad.
                                                  --Pope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

butler
    n 1: a manservant (usually the head servant of a household) who
         has charge of wines and the table [syn: butler,
         pantryman]
    2: English novelist who described a fictitious land he called
       Erewhon (1835-1902) [syn: Butler, Samuel Butler]
    3: English poet (1612-1680) [syn: Butler, Samuel Butler]