Source : Webster's Revised Unabridged Dictionary (1913)

Butler \But"ler\, 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.

         The butler and the baker of the king of Egypt. --Gen.
                                                  xl. 5.

         Your wine locked up, your butler strolled abroad.
                                                  --Pope.

Source : WordNet®

butler
     n : a manservant (usually the head servant of a household) who
         has charge of wines and the table [syn: {pantryman}]