bar

1. A solid, more or less rigid object of metal or wood with a uniform cross-section smaller than its length. (countable, uncountable) · The window was protected by steel bars.
2. A solid metal object with uniform (round, square, hexagonal, octagonal or rectangular) cross-section; in the US its smallest dimension is ¹⁄₄ inch or greater, a piece of thinner material being called a strip. (countable, uncountable) · Ancient Sparta used iron bars instead of handy coins in more valuable alloy, to physically discourage the use of money.· We are expecting a carload of bar tomorrow.
3. A cuboid piece of any solid commodity. (countable, uncountable) · bar of chocolate· bar of soap
4. A broad shaft, band, or stripe. (countable, uncountable) · a bar of light· a bar of colour
5. A long, narrow drawn or printed rectangle, cuboid or cylinder, especially as used in a bar code or a bar chart. (countable, uncountable)
6. Any of various lines used as punctuation or diacritics, such as the pipe ⟨|⟩, fraction bar (as in 12), and strikethrough (as in Ⱥ), formerly (obsolete) including oblique marks such as the slash. (countable, uncountable)
7. The sign indicating that the characteristic of a logarithm is negative, conventionally placed above the digit(s) to show that it applies to the characteristic only and not to the mantissa. (countable, uncountable)
8. A similar sign indicating that the charge on a particle is the negative of its usual value (and that consequently the particle is in fact an antiparticle). (countable, uncountable)

Plural bars