Wordnet 3.0
NOUN (1)
1. 
 the highest or uppermost side of anything; 
- Example: "put your books on top of the desk"- Example: "only the top side of the box was painted"[syn: top, top side, upper side, upside]
WordNet (r) 3.0 (2006):
upper side
    n 1: the highest or uppermost side of anything; "put your books
         on top of the desk"; "only the top side of the box was
         painted" [syn: top, top side, upper side, upside]