1. Designating sound transmission or recording or reproduction over a single channel
   - mono, monophonic

See also: monaural

• wood swallow
• wood tar
• wood thrush
• roiled
• roiling
• roily
• roister
• roisterer
• Rolaids
• Roland de Lassus
• Rolando's area
• Rolando's fissure
• role
• role model
• role player
• role-playing game
• roleplay
• roleplaying
• Rolf
• roll
• roll around
• roll call
• roll down
• roll film
• roll in