A die; a half-round set hammer, used for forming grooves and spreading iron; -- called also a creaser.

To form a groove or channel in, by a fuller or set hammer; as, to fuller a bayonet.

A groove in a sword blade that reduces its weight.

Groove cut longitudinally in to the blade to lighten it whilst retaining its structural integrity. [Picture

The groove forged and ground into the center of a sword blade in order to lighten it. This was not used, as in common folklore, as a "blood channel" so that blood can flow off of the blade.

A groove along that length of a blade used to reduce weight, improve balance and stiffen the blade.

Often believed to channel blood from your slain opponent and commonly called a "Blood Groove." The fuller "groove" is to lighten the blade of a sword.

Groove in a blade of a sword or dagger designed to strengthen and lighten the blade. See sword.

A groove that reduces the weight of the blade of a sword or dagger without weakening it. Also the act of the creation of a fuller shape for decorative use.

Broad groove running down the center of each side of some sword blades (usually to make the sword lighter in weight, not to allow a "channel" for blood to drip off the sword as commonly thought).

Broad groove running down the centre of each side of some sword blades. (Wise, Terence. Medieval Warfare, 248)

A groove down the center of a blade, used to both lighten a sword, and conserve sword steel (making a wider blade possible with less material). Often mistakenly called a "Blood Groove."

the groove that runs down a sword blade to reduce weight.

The groove running along some of the length of the blade of an edged weapon designed to lighten it and make it more elastic.

A Fuller is a rounded or beveled groove on the flat side of a blade, such as a sword, knife, or bayonet (shown). Although 19th century romantic fancy referred to them as "blood grooves", their purpose is to lighten and strengthen the blade, rather than to allow blood to flow from a stabbed person.