1. The alternation of two or more different forms in the life cycle of a plant or animal
   - alternation of generations, xenogenesis

Type of: organic phenomenon

• hell to pay
• Hell's Half Acre
• Hell's Kitchen
• hell-bent
• hell-for-leather
• hell-kite
• hell-rooster
• Helladic
• Helladic civilisation
• Helladic civilization
• Helladic culture
• hellbender
• hellbound
• hellcat
• hellebore
• helleborine
• Helleborus
• Helleborus foetidus
• Helleborus niger
• Helleborus orientalis
• Helleborus viridis
• Hellene
• Hellenic
• Hellenic language
• Hellenic Republic