The Collaborative International Dictionary of English v.0.48:

Aeromechanics \A`["e]r*o*me*chan"ics\, n.
   The science of equilibrium and motion of air or an
   a["e]riform fluid, including a["e]rodynamics and
   a["e]rostatics.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

aeromechanics
    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]