homaloidal
/ˌhɒməˈlɔɪdl/(also homoloidal) Mathematics
adjective
Of or relating to straight lines and planes; satisfying the axioms of Euclidean geometry, flat.
Origin
Mid 19th century; earliest use found in James Joseph Sylvester (1814–1897), mathematician. From ancient Greek ὁμαλός + -oidal.