: 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
Alison Osius, Outside Online, 1 Nov. 2024
This kit gives kids the chance to make dozens of rad electronic gadgets in a snap.
—Toby Rose, Parents, 24 Oct. 2024
Costanzo, who recently took over Opera Philadelphia and who seems to pop up almost any time something rad is happening in the opera world, sings every role in this Figaro himself.
—Sara Holdren, Vulture, 5 Sep. 2024
Skateboarding Skateboarding is enjoying its second Olympics as an official sport, which is pretty rad.
—Michael Calore, WIRED, 24 July 2024
See all Example Sentences for rad 
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Adjective
The place had a patio (some have decks) and kitchenette, a king bed and two twin beds in a loft, and a rad shower with six adjustable side jets.
—Alison Osius, Outside Online, 1 Nov. 2024
This kit gives kids the chance to make dozens of rad electronic gadgets in a snap.
—Toby Rose, Parents, 24 Oct. 2024
Costanzo, who recently took over Opera Philadelphia and who seems to pop up almost any time something rad is happening in the opera world, sings every role in this Figaro himself.
—Sara Holdren, Vulture, 5 Sep. 2024
Skateboarding Skateboarding is enjoying its second Olympics as an official sport, which is pretty rad.
—Michael Calore, WIRED, 24 July 2024
See all Example Sentences for rad
Dictionary Entries Near rad
Cite this Entry
“Rad.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rad. Accessed 8 Nov. 2024.
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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