The Collaborative International Dictionary of English v.0.48:

aerodynamics \aer`o*dy*nam"ics\ Aerodynamics
\A`["e]r*o*dy*nam"ics\, n. [A["e]ro- + dynamics: cf. F.
   a['e]rodynamique.]
   The science which treats of the air and other gaseous bodies
   under the action of force, and of their mechanical effects.
   [1913 Webster]

WordNet (r) 3.0 (2006):

aerodynamics
    n 1: the branch of mechanics that deals with the motion of gases
         (especially air) and their effects on bodies in the flow
         [syn: aeromechanics, aerodynamics]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "aerodynamics":
   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