1. A fictional material (either a metal or crystalline mineral) that has a detrimental effect on Superman

Encyclopedia: Kryptonite

• renal lithiasis
• renal pelvis
• renal vein
• rename
• renascence
• renascent
• Renata Tebaldi
• rencounter
• rend
• render
• render-set
• renderer
• rendering
• rendezvous
• rending
• rendition
• rendzina
• Rene Antoine Ferchault de Reaumur
• Rene Descartes
• Rene Magritte
• Rene-Robert Cavelier
• renegade
• renegade state
• renege
• renege on