Affixes

A lens that is planoconcave has one surface plane and the opposite one concave, while a planoconvex one has the curved face convex; the adjective planographic refers to a printing process in which the printing surface is flat, as in lithography; a planisphere is a map formed by the projection of a sphere or part of a sphere on a plane; a planometer is a flat plate used in metalwork as a standard gauge for plane surfaces, while a planimeter is an instrument for mechanically measuring the area of a plane figure; a planarian is a type of flatworm; in medicine, planigraphy is the process of obtaining a visual representation of a plane section through living tissue.