Bore may refer to:

• The action of carving out a hole
  • The tool creating this hole, i.e. a drill bit, especially in precision work
  • The hole thus created; e.g. in reference to a well
  • The hole down the middle of a wind instrument
  • The inner diameter of a pipe or tube
  • The diameter of a cylinder in a piston engine, see also stroke (engines)
  • The caliber of a gun; as a measurement it is generally used to refer to smoothbore guns such as shotguns and muskets and is generally used as equivalent to gauge which is the number of balls per pound of lead, later expressed in inches or millimeters. This use is generally archaic, though still used in British English. The exception is the .410 bore, which is .410 inches.
• Tidal bore, a wave in a river caused by an incoming tide
• Bore, a person who is boring
• Bore Steamship Company, a Finnish shipping company
• Bore, Italy, a city in the province of Parma in Italy.

See also

• boar (the animal)

Dutch loanwords | Firearm components