backprojecting
back-projection
back-pull
back-reference
back-reflection
backrest
backrest-adjustable
backrolling
backs
backscatter
  backscattering
back-search
back-seating
backsheeting
backshift
back-shot
back-side
backside
backsill
backslant
backslope

    backscattering cross-section

    эффективная площадь отражения в обратном направлении