1. (biology) a hypothetical force (not physical or chemical) once thought by Henri Bergson to cause the evolution and development of organisms
   - life force, vital force, vitality

Type of: force

• dragnet
• dragoman
• dragon
• dragon arum
• dragon lizard
• dragon tree
• dragon's blood
• dragon's eye
• dragon's head
• dragon's mouth
• dragonet
• dragonfly
• dragonhead
• dragoon
• dragster
• Dragunov
• dragée
• drain
• drain basket
• drain the cup
• drainage
• drainage area
• drainage basin
• drainage ditch
• drainage system