parahelium
/ˌparəˈhiːlɪəm/(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.
- ratifier
- ratify
- ratine
- rating
- rating badge
- rating franchise
- rating qualification
- ratiné
- ratio
- ratiocinate
- ratiocination
- ratiocinative
- ratiocinatively
- ratiocinator
- ratiocinatory
- ratio cognoscendi
- ratio decidendi
- ratio detector
- ratioed
- ratio essendi
- ratio existendi
- ratioing
- ratiometer
- ratio meter
- ratiomorphic