One of the mysteries of the English language finally explained.
Relating to or of the nature of a variable quantity that transforms as a scalar under rotation but changes sign under reflection; described or represented mathematically by such a quantity.
A pseudoscalar quantity. Also: a subatomic particle whose wave function is such a quantity, the particle having zero spin and odd parity.
1920s; earliest use found in Proceedings of the Royal Society of London. From pseudo- + scalar.
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