euclidean

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective euclidean is

(rare).

As an adjective euclidean

is (rare).

As a noun euclidianness is

having the property of being euclidean.

As an adjective euclidean

is (rare).

As a noun horosphere is

an $n-1$-dimensional hyperplane in hyperbolic $n$-dimensional space: it is (in the ) euclidean-tangent at infinity to the boundary sphere or (in the upper-half-space model) euclidean-parallel to the boundary hyperplane.

Euclidean is a related term of euclid.

As an adjective euclidean

is (rare).

As a proper noun euclid is

euclid of alexandria, a greek mathematician.