Etymology
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dipsomaniac (n.)

"drunkard, one suffering from an uncontrollable craving for strong drink," 1844, from dipsomania on the model of maniac. Slang shortening dipso is attested by 1880.

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Definitions of dipsomaniac

dipsomaniac (n.)
a person who drinks alcohol to excess habitually;
Synonyms: alcoholic / alky / boozer / lush / soaker / souse
From wordnet.princeton.edu