Source : Webster's Revised Unabridged Dictionary (1913)

Bacon \Ba"con\, n. [OF. bacon, fr. OHG. bacho, bahho, flitch of
   bacon, ham; akin to E. back. Cf. Back the back side.]
   The back and sides of a pig salted and smoked; formerly, the
   flesh of a pig salted or fresh.

   {Bacon beetle} (Zo["o]l.), a beetle ({Dermestes lardarius})
      which, especially in the larval state, feeds upon bacon,
      woolens, furs, etc. See {Dermestes}.

   {To save one's bacon}, to save one's self or property from
      harm or less. [Colloq.]

Source : WordNet®

bacon
     n 1: back and sides of a hog salted and dried or smoked; usually
          sliced thin and fried
     2: English scientist and Franciscan monk who stressed the
        importance of experimentation; first showed that air is
        required for combustion and first used lenses to correct
        vision (1220-1292) [syn: {Roger Bacon}]
     3: English statesman and philosopher; precursor of British
        empiricism; advocated inductive reasoning (1561-1626)
        [syn: {Francis Bacon}, {Sir Francis Bacon}, {Baron Verulam},
         {1st Baron Verulam}, {Viscount St. Albans}]