Is “Backscatter” a Scrabble word?

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Yes
BACKSCATTER
Valid in at least one Scrabble dictionary

Valid in these dictionaries

SOWPODS / CSW
Scrabble UK & International
Valid
TWL / NWL
Scrabble North America
Valid
Large English Dictionary
General English word list
Valid

Meaning of Backscatter

noun
  1. 1.The deflection of particles and/or radiation through angles greater than 90 degrees to the original direction of travel.

  2. 2.The particles and/or radiation deflected in this manner.

  3. 3.A portion of the energy of electromagnetic radiation such as a laser or radio waves that is scattered back in the direction of the source of radiation by an obscurant.

verb
  1. 1.To scatter particles and/or radiation back to the direction from which they come.