Oxford Dictionary English alpha particle nounnoun BrE BrE//ˈælfə pɑːtɪkl// ; NAmE NAmE//ˈælfə pɑːrtɪkl// (specialist) Molecules and matter Add to my wordlistjump to other results the nucleus of a helium atom; a particle with a positive electrical charge, that is produced in a nuclear reaction See related entries: Molecules and matterSee alpha particle in the Oxford Advanced American DictionaryCheck pronunciation: alpha particle oxfordlearnersdictionaries.com
