Wordnet 3.0
ADJECTIVE (1)
1. 
 of or relating to or resembling the physical or orbital characteristics of a planet or the planets; 
- Example: "planetary motion"- Example: "planetary year"[syn: planetal, planetary]
WordNet (r) 3.0 (2006):
planetal
    adj 1: of or relating to or resembling the physical or orbital
           characteristics of a planet or the planets; "planetary
           motion"; "planetary year" [syn: planetal, planetary]