pseudoscalar

[soo-duh-skey-ler]
adjective Physics, Mathematics.
a scalar quantity that changes sign when the sense of the orientation of the coordinate system is changed.

Origin:
1940–45; pseudo- + scalar

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World English Dictionary
pseudoscalar (ˌsjuːdəʊˈskeɪlə)
 
n
maths pseudovector scalar tensor Compare vector a variable quantity that has magnitude but not direction and is an odd function of the coordinates

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Example sentences
The full lowest-lying pseudoscalar and vector multiplets are included in the program.
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