bracer

noun5

1. •
   That which braces, binds, or makes firm; a band or bandage.
2. •
   Something bracing; a stimulant.

   • Country air in the fields, or in gardens, when breathed at proper hours, is an excellent bracer of the nerves, and a sure brightener of the complexion. — 1830
3. •
   A medicine, as an astringent or a tonic, which gives tension or tone to any part of the body.
4. •
   A covering to protect the arm of the bowman from the vibration of the string.

   • To prevent the bow string from hanging on the left arm, it is covered with a piece of smooth leather, fastened on the outside of the arm, this is called a bracer. — 1786
5. •
   Armor for the forearm; a brassard.