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

• frontal bone
• frontal cortex
• frontal eminence
• frontal gyrus
• frontal lobe
• frontal lobotomy
• frontal sinus
• frontal suture
• frontally
• frontbencher
• frontier
• frontier settlement
• frontiersman
• frontierswoman
• frontispiece
• frontlet
• frontmost
• frontstall
• frontward
• frontwards
• frore
• frosh
• frost
• frost fish
• frost heave