non-Euclidean

From non- +‎ Euclidean.

non-Euclidean (not comparable)

1. of, or relating to non-Euclidean geometry
   • 1928 February, H[oward] P[hillips] Lovecraft, “The Call of Cthulhu”, in Farnsworth Wright, editor, Weird Tales: A Magazine of the Bizarre and Unusual, volume 11, number 2, Indianapolis, Ind.: Popular Fiction Pub. Co., →OCLC, pages 159–178 and 287:

     He said that the geometry of the dream-place he saw was abnormal, non-Euclidean, and loathsomely redolent of spheres and dimensions apart from ours.