Definition of beta ray
1
: beta particle
2
: a stream of beta particles
— called also beta radiation
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
Who Knew?
-
- What is a ruelle?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
Anagram puzzles meet word search.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Share beta ray
Time Traveler for beta ray
The first known use of beta ray was in 1902
See more words from the same year