'Thirster' definitions:

Definition of 'thirster'

From: WordNet
noun
A person with a strong desire for something; "a longer for money"; "a thirster after blood"; "a yearner for knowledge" [syn: longer, thirster, yearner]

Definition of 'Thirster'

From: GCIDE
  • Thirster \Thirst"er\, n. One who thirsts. [1913 Webster]