Wordnet 3.0
NOUN (1)
1. 
 a small reddish planet that is the 4th from the sun and is periodically visible to the naked eye; 
 minerals rich in iron cover its surface and are responsible for its characteristic color; 
- Example: "Mars has two satellites"[syn: Mars, Red Planet]
WordNet (r) 3.0 (2006):
Red Planet
    n 1: a small reddish planet that is the 4th from the sun and is
         periodically visible to the naked eye; minerals rich in
         iron cover its surface and are responsible for its
         characteristic color; "Mars has two satellites" [syn:
         Mars, Red Planet]