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

Derived forms: dialogists

• wattmeter
• Watts
• Watusi
• Watutsi
• Waugh
• waul
• Wausau
• wave
• wave angle
• wave equation
• wave mechanics
• wave number
• wave shape
• wave theory
• wave theory of light
• wave train
• substantive dye
• substantively
• substantivise
• substantivize
• substation
• substituent
• substitutability
• substitutable
• substitute