Definition of planographic in US English:

planographic

adjective

Printing
  • Relating to or denoting a printing process in which the printing surface is flat, as in lithography.

    • ‘The two major planographic techniques are offset and lithography.’
    • ‘The technique for producing a lithograph is called planographic because the printing surface is a flat plane and is neither built up nor cut into.’

Pronunciation

planographic

/ˌplānəˈɡrafik/