1. Flat on one side and concave on the other

See also: concave

• arcus
• arcus senilis
• arcus zygomaticus
• ARDA
• Ardea
• Ardea herodius
• Ardea occidentalis
• ardeb
• Ardeidae
• ardency
• Ardennes
• Ardennes counteroffensive
• ardent
• ardent spirits
• ardently
• Ardisia
• Ardisia crenata
• Ardisia escallonoides
• Ardisia paniculata
• ardor
• ardour
• ARDS
• arduous
• arduously
• arduousness