ˈalpha ˌparticle BrE AmE noun [countable] technical
an ATOMIC PARTICLE consisting of two ↑ proton s and two ↑ neutron s that is sent out by some ↑ radioactive substances
ˈalpha ˌparticle BrE AmE noun [countable] technical
an ATOMIC PARTICLE consisting of two ↑ proton s and two ↑ neutron s that is sent out by some ↑ radioactive substances
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012