- a combining form meaning “flat,” “plane,” used in the formation of compound words: planography.
- a combining form meaning “moving,” “capable of movement,” used in the formation of compound words: planogamete.
- indicating flatness or planenessplano-concave
alternative form of Latin plani- “flat, level,” but also used in sciences as a comb. form of Greek planos “wandering” (see planet). pref.