(optics) Describing an apochromatic lens system that produces a planar (flat) field

A surname. / A rural village in Victoria, Australia. / A small town in the Tasman Region of New Zealand. / A town in Limpopo, South Africa. / A small city in Henderson County, Texas, United States.

The quality of being something else.

(archaic) White or pale; without colour. / Free from writing, printing, or marks; having an empty space to be filled in / (figuratively) Lacking characteristics which give variety; uniform.