bar

noun

1. A solid, more or less rigid object of metal or wood with a uniform cross-section smaller than its length.

2. (countable, uncountable, metallurgy) 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.

3. A cuboid piece of any solid commodity.

4. A broad shaft, band, or stripe.

5. A long, narrow drawn or printed rectangle, cuboid or cylinder, especially as used in a bar code or a bar chart.

6. (mathematics) 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.

7. (physics) 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).

8. A business selling alcoholic drinks for consumption on the premises, or the premises themselves; a public house.