1. Something desirable but not likely to happen

Encyclopedia: Pie in the sky

• Arcturus
• arcuate
• arcuate artery
• arcuate artery of the kidney
• arcuate vein of the kidney
• 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