homaloidal

from The Collaborative International Dictionary of English v.0.48

Homaloid \Hom"a*loid\ (h[o^]m"[.a]*loid), Homaloidal
\Hom`a*loid"al\ (-loid"al), a. [Gr. "omalo`s even + -oid.]
   (Geom.)
   Flat; even; -- a term applied to surfaces and to spaces,
   whether real or imagined, in which the definitions, axioms,
   and postulates of Euclid respecting parallel straight lines
   are assumed to hold true.
   [1913 Webster]