1. Not damaging to the environment, or directed at preventing environmental damage
   - green, environmentally-friendly

Encyclopedia: Eco-friendly

• roulette ball
• roulette wheel
• Roumania
• Roumanian
• round
• round angle
• round arch
• round bone
• round clam
• round dance
• round dancing
• round down
• round file
• round hand
• round kumquat
• round ligament of the uterus
• round of drinks
• round of golf
• round off
• round out
• round robin
• round scad
• round shape
• round shot
• round steak