: a unit of absorbed dose of ionizing radiation equal to an energy of 100 ergs per gram of irradiated material
slang
1
radian
2
radius
3
radix
Examples of rad in a Sentence
Recent Examples on the Web
Christopher Cruz, Rolling Stone, 20 Oct. 2025
Learn about all the extra rad benefits and become a member yourself at Outside Online Dot Com Slash Pod Plus.
—Outside Online, 15 Oct. 2025
There’s also a video interview where the pregnant Kirby talks about her childbirth scene in the movie, a sneak peek at the film’s fantastic foes (including Julia Garner’s rad Silver Surfer), plus updates to our Marvel movie ranking and franchise viewing order.
—Brian Truitt, USA Today, 25 July 2025
An actual floppy disk drive for old games would have been rad, though, as would a crusty 28K modem to use for dial-up internet.
—Mitch Wallace, Forbes.com, 23 July 2025
See All Example Sentences for rad
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Adjective
This is an experience for people who think chasing demon sharks on surfboards is rad, and whose not-so-guilty pleasures include using a bad guy’s head like a soccer ball while EDM blasts in the background.
—Christopher Cruz, Rolling Stone, 20 Oct. 2025
Learn about all the extra rad benefits and become a member yourself at Outside Online Dot Com Slash Pod Plus.
—Outside Online, 15 Oct. 2025
There’s also a video interview where the pregnant Kirby talks about her childbirth scene in the movie, a sneak peek at the film’s fantastic foes (including Julia Garner’s rad Silver Surfer), plus updates to our Marvel movie ranking and franchise viewing order.
—Brian Truitt, USA Today, 25 July 2025
An actual floppy disk drive for old games would have been rad, though, as would a crusty 28K modem to use for dial-up internet.
—Mitch Wallace, Forbes.com, 23 July 2025
See All Example Sentences for rad
Cite this Entry
“Rad.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rad. Accessed 3 Nov. 2025.
Copy CitationMedical Definition
rad
1 of 2 noun
: a unit of absorbed dose of ionizing radiation equal to an energy of 100 ergs per gram of irradiated material
rad
2 of 2 abbreviation
root
—used in writing prescriptions
Etymology
Abbreviation
Latin radix
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