ap·pla·nate \ˈapləˌnāt, (ˈ)a|plāˌn-\adjective Etymology: Medieval Latin applanatus, past participle of applanare to flatten, from Latin ad- + Late Latin planare to flatten, from Latin planus even — more at field : flattened or horizontally expanded < the applanate thallus of certain liverworts and lichens >