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

Encyclopedia: Kryptonite

• superior vocal cord
• superiority
• superiority complex
• superjacent
• superlative
• Hydnaceae
• Hydnocarpus
• Hydnocarpus kurzii
• Hydnocarpus laurifolia
• hydnocarpus oil
• Hydnocarpus wightiana
• Hydnoraceae
• Hydnum
• hydr-
• hydra
• hydralazine
• hydramnios
• hydrangea
• Hydrangea anomala
• Hydrangea arborescens
• hydrangea family
• Hydrangea macrophylla hortensis
• Hydrangea paniculata
• Hydrangea petiolaris
• Hydrangeaceae