Search Result for "eavesdropper": 
Wordnet 3.0

NOUN (1)

1. a secret listener to private conversations; 



The Collaborative International Dictionary of English v.0.48:

Eavesdropper \Eaves"drop`per\, n.
   One who stands under the eaves, or near the window or door of
   a house, to listen; hence, a secret listener.
   [1913 Webster]


WordNet (r) 3.0 (2006):

eavesdropper
    n 1: a secret listener to private conversations