1. The doctrine of vital forces or energy 
2. The branch of biology which treats of the active vital phenomena of organisms; - opposed to biostatics

Encyclopedia: Biodynamics

• surd
• sure
• sure as shooting
• sure thing
• sure-enough
• sure-fire
• sure-handed
• surefooted
• surely
• sureness
• surety
• surety bond
• suretyship
• surf
• surf casting
• surf fishing
• surface
• surface area
• surface assimilation
• surface brightness
• surface chemistry
• Sicilian pizza
• Sicily
• sick
• sick benefit