Wordnet 3.0
ADJECTIVE (1)
1. 
 describing a circle; 
 moving in a circle; 
- Example: "the circular motion of the wheel"[syn: circular, rotary, orbitual]
WordNet (r) 3.0 (2006):
orbitual
    adj 1: describing a circle; moving in a circle; "the circular
           motion of the wheel" [syn: circular, rotary,
           orbitual]