Wordnet 3.0
ADJECTIVE (1)
1. 
 having or as if having three legs; 
- Example: "a three-legged stool"- Example: "a three-legged race"
WordNet (r) 3.0 (2006):
three-legged
    adj 1: having or as if having three legs; "a three-legged
           stool"; "a three-legged race"