A solid metal object with uniform (round, square, hexagonal, octagonal or rectangular) cross-section; in the US its smallest dimension is inch or greater, a piece of thinner material being called a strip.
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).
From Middle English barre, from Old French barre, from Vulgar Latin *barra, of uncertain origin. barre.
From Middle English barren, from Old French barrer, from Medieval Latin barrare ("to bar"), from the noun. Cognate Occitan barrar, Spanish barrar, Portuguese barrar.
Preposition properly imperative of the verb. Compare barring.
Borrowed from Ancient Greek βάρος, coined circa 1900.
Modern English dictionary
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