euclidian

adj

1. (alt-of, alternative, not-comparable)Alternative spelling of Euclidean.
2. (alt-of, not-comparable)Alternative letter-case form of Euclidian.

   “If no triangle had ever existed it would still remain true that the sum of the angles of a euclidian triangle is equal to two right-angles. In this sense it may be said that these sciences proffer us eternal truths.”