Medical Dictionary

alpha particle


Medical Definition of ALPHA PARTICLE

:  a positively charged nuclear particle identical with the nucleus of a helium atom that consists of two protons and two neutrons and is ejected at high speed in certain radioactive transformations—called also alpha, alpha ray


How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears