#retarding_force__retardingforce__drag  the phenomenon of resistance to motion through a fluid
  supertype:  #resistance.mechanical_phenomenon  any mechanical force that tends to retard or oppose motion
  subtype:  #sonic_barrier__sonicbarrier__sound_barrier__soundbarrier  the increase in aerodynamic drag as an airplane approaches the speed of sound
  subtype:  #windage.retarding_force  the retarding force of air friction on a moving object

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