radiation therapy

noun

: radiotherapy

Examples of radiation therapy in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Bristal now faces six weeks of radiation therapy. — Rachel Raposas, PEOPLE, 11 May 2026 In some cases, surgery is required to remove an adrenal tumor, or radiation therapy is needed to shrink a growing pituitary tumor. — The Washington Post, San Diego Union-Tribune, 30 May 2026 Netanyahu began undergoing radiation therapy about two and a half months ago, according to the source, and had recently completed the treatment. — Tal Shalev, CNN Money, 24 Apr. 2026 Remove the prostate surgically or do a combination of radiation therapy and hormone therapy. — Angus Chen, STAT, 31 May 2026 See All Example Sentences for radiation therapy

Word History

First Known Use

1922, in the meaning defined above

Time Traveler
The first known use of radiation therapy was in 1922

Rhymes for radiation therapy

See All Rhymes for radiation therapy

Browse Nearby Words

radiation sickness
radiation therapy
radiative
See all Nearby Words

Cite this Entry

“Radiation therapy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radiation%20therapy. Accessed 8 Jul. 2026.

Copy Citation

Medical Definition

radiation therapy

noun
: radiotherapy

More from Merriam-Webster on radiation therapy

Britannica.com: Encyclopedia article about radiation therapy

Last Updated: - Updated example sentences
Love words? Need even more definitions?

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

More from Merriam-Webster

Word of the Day

Listen to the pronunciation of gambol

See Definitions and Examples »

Popular in Grammar & Usage

See More

Is that lie 'bald-faced' or 'bold-faced'?

'A' or 'an'? What about before 'h'? An Indefinite Article Guide

Why is '-ed' sometimes pronounced at the end of a word?

Commonly Misspelled Words

How to Use Em Dashes (—), En Dashes (–) , and Hyphens (-)
See More

Popular in Wordplay

See More

14 Phobias You Probably Haven't Heard Of

The Longest Long Words List

One-Word Oxymorons: Bittersweet, Spendthrift, and More

Ten Words Ending with a Silent ‘T’

12 Lovely and Unusual Words for the Natural World
See More

Popular

See More

Is that lie 'bald-faced' or 'bold-faced'?

14 Phobias You Probably Haven't Heard Of

The Longest Long Words List
See More

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
The Missing Letter A daily crossword with a twist
hangman letters and game
Hangman Lightning Round Figure out which word fits in the blanks.
See All