Wordnet 3.0
NOUN (1)
1. 
 an assistant editor; 
The Collaborative International Dictionary of English v.0.48:
Subeditor \Sub*ed"i*tor\, n.
   An assistant editor, as of a periodical or journal.
   [1913 Webster]
WordNet (r) 3.0 (2006):
subeditor
    n 1: an assistant editor