Wordnet 3.0
ADJECTIVE (1)
1. 
 relating to geometry as developed by Euclid; 
- Example: "Euclidian geometry"[syn: euclidian, euclidean]
WordNet (r) 3.0 (2006):
euclidean
    adj 1: relating to geometry as developed by Euclid; "Euclidian
           geometry" [syn: euclidian, euclidean]