EUCLIDIAN
euclidian, euclidean
(adjective) relating to geometry as developed by Euclid; “Euclidian geometry”
Source: WordNet® 3.1
Etymology
Adjective
Euclidian (not comparable)
Alternative spelling of Euclidean
Source: Wiktionary
Eu*clid"i*an, n.
Definition: Related to Euclid, or to the geometry of Euclid. Euclidian
space (Geom.), the kind of space to which the axioms and definitions
of Euclid, relative to straight lines and parallel lines, apply; --
called also flat space, and homaloidal space.
Source: Webster’s Unabridged Dictionary 1913 Edition