plan- I. combining form orplano- Etymology: probably from New Latin, from Greek, wandering, from planos; akin to Greek planasthai to wander — more at planet : moving about : motile < planuria > < planogamete > II. combining form orplano- Etymology: Latin planus flat, level — more at floor 1.: flat < planometer > < planoccipital > 2.: flatly < planorotund > 3.: flat and < plano-concave >