Merriam-Webster Logo
SINCE 1828
Menu
×

beta ray

noun

Definition of beta ray

1 : beta particle
2 : a stream of beta particles — called also beta radiation

See beta ray defined for kids

First Known Use of beta ray

1902

in the meaning defined at sense 1

See Words from the same year
NEW! Time Traveler

Medical Dictionary

beta ray

noun

medical Definition of beta ray

1 : beta particle
2 : a stream of beta particles

Learn More about beta ray

  1. See words that rhyme with beta ray

Seen and Heard

What made you want to look up beta ray? Please tell us where you read or heard it (including the quote, if possible).

show hide

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

jabberwocky

play

meaningless speech or writing

Get Word of the Day daily email!

TRENDING NOW

  1. insubordinate 'disobedient to authority'

  2. promulgate 'to make known by open declaration'

  3. epochal 'momentous or unparalleled'

  4. clemency 'merciful treatment of someone who could be given harsh punishment'

  5. suborn 'to induce to commit perjury'

SEE ALL

BROWSE DICTIONARY

beta ray

Test Your Vocabulary

Name More Food!

  • red-fruit
  • Name that Fruit!
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play

Ask the Editors

Word Games