Backscatter Definition
 băkskătər 
    noun
  
 (physics) The deflection of particles and/or radiation through angles greater than 90 degrees to the original direction of travel.
Wiktionary 
The particles and/or radiation deflected in this manner.
 Wiktionary 
The deflection of radiation or particles by electromagnetic or nuclear forces through angles greater than 90° to the initial direction of travel.
 American Heritage 
    verb
  
 To scatter particles and/or radiation back to the direction from which they come.
Wiktionary 
Origin of Backscatter
- Back-formation from backscattering. - From Wiktionary 
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