The Collaborative International Dictionary of English v.0.48:

Dipsomania \Dip`so*ma"ni*a\, n. [NL., fr. Gr. ? thirst + ?
   mania.] (Med.)
   A morbid an uncontrollable craving (often periodic) for
   drink, esp. for alcoholic liquors; also improperly used to
   denote acute and chronic alcoholism.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dipsomania
    n 1: an intense persistent desire to drink alcoholic beverages
         to excess [syn: dipsomania, alcoholism, potomania]