delta ray


: 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.” Dictionary, Merriam-Webster, Accessed 26 May. 2024.

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!