DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   moan
       n 1: an utterance expressing pain or disapproval [syn: groan,
            moan]
       v 1: indicate pain, discomfort, or displeasure; "The students
            groaned when the professor got out the exam booklets"; "The
            ancient door soughed when opened" [syn: groan, moan]