Definition of parahelium in English:

parahelium

(also parhelium)

noun

  • The form of helium whose spectrum does not exhibit the fine structure of triplets present in the spectrum of orthohelium, owing to the spins of the two orbital electrons being antiparallel.

Origin

Late 19th century. From para- + helium.

Pronunciation

parahelium

/ˌparəˈhiːlɪəm/