Plano

(pla'no.) [From L. plan us, flat.] (Geom., dc.) A prefix used variously: thus, plano-conical signifies plane or flat on one side, and conical on the other; plano-concave, plano-convex, flat on one side and concave or convex on the other; plano-horizontal, having a level horizontal surface or position; plano-subulate, smooth and awl-shaped. [s. 714]