bourrelet

Borrowed from French bourrelet.

bourrelet (plural bourrelets)

1. (firearms, weaponry) An accurately machined portion around the diameter of a shell of a gun, which acts to increase accuracy of projectile fit to the barrel.
   • 2019, Thomas Gersbeck, Practical Military Ordnance Identification, 2nd edition, CRC Press, →ISBN, page 111:

     The bourrelet is a slightly raised surface on the rocket designed to maintain a light contact with the inside of the launching tube to center the rocket when fired.

• driving band
• ogive

From bourre +‎ -et (influenced by Old French bourrel).

• IPA^(key): /buʁ.lɛ/

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bourrelet m (plural bourrelets)

1. padding
2. roll of fat
3. (firearms) bourrelet

• “bourrelet”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.