Pronunciation: ˌ j ā - ' s ī -, - ' ps ī -
Function: noun
Date: 1977
: an unstable neutral fundamental particle of the meson group that has a mass about 6000 times the mass of an electron ― called also J particle J/psi psi particle
Pronunciation: ˌ j ā - ' s ī -, - ' ps ī -
Function: noun
Date: 1977
: an unstable neutral fundamental particle of the meson group that has a mass about 6000 times the mass of an electron ― called also J particle J/psi psi particle
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012