hyperfine

adjective
hy·​per·​fine | \ ˈhī-pər-ˌfīn \

Definition of hyperfine

: being or relating to a fine-structure multiplet occurring in an atomic spectrum that is due to interaction between electrons and nuclear spin

First Known Use of hyperfine

1926, in the meaning defined above

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The first known use of hyperfine was in 1926

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