The Collaborative International Dictionary
Homaloid
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.
Wiktionary
homaloid
n. (context geometry English) An element of a homaloidal system, in particular the image of a hyperplane under a Cremona transformation.