virial

noun
vir·​i·​al | \ˈvirēəl\
plural -s

Definition of virial 

: half the product of the stress due to the attraction or repulsion between two particles in space times the distance between them or in the case of more than two particles half the sum of such products taken for the entire system

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History and Etymology for virial

German, from Latin vires, plural, strength, power + German -ial; akin to Latin vis strength, force, violence

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