(n.) The doctrine of vital forces or energy.

aerial photography aeroballistics aerogeology aerography aerology aeromechanics aeromedicine aerometry aeronautical meteorology aerophotography aerophysics aeroscopy aerospace research aerostatics air atmosphere aviation technology avionics barodynamics biodynamics climatology dynamics fluid fluid dynamics gas geodynamics halogen gas hydrodynamics hydrostatics inert gas kinematics kinesiology kinetics magnetohydrodynamics meteorology myodynamics photometry pneumatics rocketry supersonics thermodynamics zoodynamics