delta ray

noun

: an electron ejected by an ionizing particle in its passage through matter

Word History

First Known Use

1908, in the meaning defined above

Time Traveler
The first known use of delta ray was in 1908

Dictionary Entries Near delta ray

Cite this Entry

“Delta ray.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/delta%20ray. Accessed 8 Feb. 2023.

More from Merriam-Webster on delta ray

Love words? Need even more definitions?

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


Commonly Confused Words Quiz

  • vector image of a face with thought expression
  • I went to the ______ store to buy a birthday card.
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?

PLAY