1. A writer of dialogues 
2. A speaker in a dialogue

Derived forms: dialogists

• firm
• firm omelet
• firm up
• firmament
• firmamental
• firman
• firmer chisel
• Firmiana
• Firmiana simplex
• firmly
• firmness
• firmness of purpose
• firmware
• first
• first aid
• First Amendment
• first and last
• first appearance
• first balcony
• First Baron Beveridge
• First Baron Kelvin
• First Baron Lytton
• First Baron Macaulay
• First Baron Marks of Broughton
• First Baron Passfield