Subscriber login
Password
Forgot your password?
Library card login
Login with Shibboleth® »
Login with Athens »
Close menu
Oxford Dictionaries Online
The world's most trusted dictionaries
About
Subscriber services
What's new
Contact us
Help
Subscribe now
Already a subscriber or in a subscribing organization?
Login
Dictionary
Other language resources
US English
World English
Dictionary
Better writing
World of words
Puzzles and games
For children and schools
For learners of English
Email
Cite
alpha particle
(alpha par|ticle)
noun
Physics
a helium nucleus emitted by some radioactive substances, originally regarded as a ray.
More words in this category
angle of incidence
centripetal force
deflector
extinction
fluorography
fusion
G
2
irradiation
Leyden jar
ozone layer
penumbra
ray
1
scintillator
superheavy
translate
ultraviolet
viscometer
Nearby Words
alpenglow
alpenhorn
alpenstock
Alpert, Herb
alpha
alpha blocker
Alpha Centauri
alpha geek
alpha male
alpha particle
alpha radiation
alpha rhythm
alpha test
alpha-hydroxy acid
alphabet
alphabet soup
alphabetical
alphabetize
alphafetoprotein