DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   MAOI
       n 1: any of a group of antidepressant drugs that inhibit the
            action of monoamine oxidase in the brain and so allow
            monoamines to accumulate [syn: monoamine oxidase
    inhibitor, MAOI]