(in the early Christian church) a letter, written by a patriarch, archbishop, or bishop to a cleric under his authority, announcing the date of the next Easter festival.
- Paschen-Back effect
[pah-shuh n-bahk] /ˈpɑ ʃənˈbɑk/ noun, Physics. 1. a splitting of spectral lines observed when the source of a radiation is subjected to a strong magnetic field, caused when the vectors associated with the spin and orbital angular momentum exhibit individual rather than common precession.
- Paschen body
Paschen body Pa·schen body (pāsh’ən, pä’shən) n. A particle of virus observed in relatively large numbers in squamous cells of the skin in smallpox or vaccinia.
[pah-shuh n] /ˈpɑ ʃən/ noun, Physics. 1. a series of lines in the infrared spectrum of hydrogen.
[pah-skan] /pɑˈskɛ̃/ noun 1. Jules [zhyl] /ʒül/ (Show IPA), (Julius Pincas) 1885–1930, French painter, born in Bulgaria.