HyperDic: radioactivity

English > 1 sense of the word *radioactivity*:
NOUN	process	radioactivity, radiation	the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay

radioactivity > pronunciation
Sounds	rey'diyowaektih'vahtiy; rey.diyowaektih'vahtiy
Rhymes	ability ... zloty: 638 rhymes with tiy...

English > *radioactivity*: 1 sense > noun 1, process
Meaning	The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay.
Synonym	radiation
Narrower	corpuscular radiation, particulate radiation	A stream of atomic or subatomic particles that may be charged positively (e.g. alpha particles) or negatively (e.g. beta particles) or not at all (e.g. neutrons)
Broader	emission	The release of electrons from parent atoms
Spanish	radiación, radiactividad, radioactividad
Catalan	radioactivitat
Adjectives	radioactive	exhibiting or caused by radioactivity