1. Flat on one side and convex on the other

See also: bulging, convex

• Rossetti
• Rossini
• Rostand
• rostellum
• roster
• Rostock
• Rostov
• Rostov na Donu
• Rostov on Don
• rostral
• rostrate
• rostrum
• Roswell
• rosy
• rosy boa
• rosy-cheeked
• rosy-colored
• rosy-coloured
• rosy-purple
• rot
• rot-resistant
• rota
• Rotarian
• rotary
• rotary actuator