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Wikipedia

ERW

ERW may refer to:

  • Electric resistance welding
  • Energy return wheel for non-pneumatic wheel.
  • Enhanced radiation weapon
  • Explosive remnants of war, a term for unexploded ordnance
Wiktionary

erw

n. (context historical English) A medieval Welsh unit of surface area equal to 11664 sq. foot or about ΒΌ acre.