The Collaborative International Dictionary of English v.0.48:

Busybody \Bus"y*bod`y\ (-b[o^]d`[y^]), n.; pl. Busybodies
   (-b[o^]d`[i^]z).
   One who officiously concerns himself with the affairs of
   others; a meddling person.
   [1913 Webster]

         And not only idle, but tattlers also and busybodies,
         speaking things which they ought not.    --1 Tim. v.
                                                  13.
   [1913 Webster]

WordNet (r) 3.0 (2006):

busybody
    n 1: a person who meddles in the affairs of others [syn:
         busybody, nosy-parker, nosey-parker, quidnunc]