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The fuller (sometimes erroneously referred to as a 'blood groove') is a method of reducing the weight of a blade without signicantly reducing its strength when cutting. This is similar in principle to I beams in buildings.

Fullers are not given to sword blades that are designed primarily for thrusting as they are weak when flexed sideways, as might occur during a thrust.


  • the groove allows a sword blade to be withdrawn
  • the fuller somehow strengthens the blade.

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