Definition of orthohelium in English:

orthohelium

noun

Physics
  • The form of helium whose spectrum exhibits a fine structure of triplets owing to the spins of the two orbital electrons being parallel.

Pronunciation

orthohelium

/ˌɔːθəʊˈhiːlɪəm/ /ˈɔːθəʊhiːlɪəm/

Origin

1920s. From Danish orthohelium from ortho- + helium. Coined as an antonym of the earlier parhelium.