\ ˈrad How to pronounce rad (audio) \

Definition of rad

 (Entry 1 of 3)

: a unit of absorbed dose of ionizing radiation equal to an energy of 100 ergs per gram of irradiated material



Definition of rad (Entry 2 of 3)

Definition of rad (Entry 3 of 3)

1 radian
2 radius
3 radix

Examples of rad in a Sentence

Recent Examples on the Web: Adjective Onstage, Rage Against the Machine‘s insistent, hard-core rock-rap amalgamation is nearly overmatched by its rad political clamor, spewed forth both in the songs and in the longish pauses between them. Katherine Turman, SPIN, 26 Feb. 2022 The pho is rad as-is, but adding the basil and sprouts only increased the texture and flavors. Matt Wake | Mwake@al.com, al, 15 Feb. 2022 All those questions will be answered just as surely as Jeff Probst will at some point be rocking his super-rad orange hat. Ew Staff, EW.com, 15 Dec. 2021 That includes the pretty rad custom automotive-grade blue and yellow Intel artwork adorning the chassis. Mitch Wallace, Forbes, 28 Oct. 2021 As the towering head of the Commonwealth army, Mercer is able to intimidate through silence, with part of that intimidation coming courtesy of his super-rad red armor suit. Dalton Ross, EW.com, 19 Aug. 2021 This Destiny 2 toaster does not look particularly rad. Erik Kain, Forbes, 18 June 2021 Meanwhile, there’s a new skin challenge event that’s live, with a pretty rad legendary skin for Ashe and BOB on the line, as well as come cute sprays. Kris Holt, Forbes, 22 June 2021 The Mamas & The Papas were rad, but right now rock needs new songs as singles, not covers. Matt Wake | Mwake@al.com, al, 1 June 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'rad.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of rad


circa 1953, in the meaning defined above


1982, in the meaning defined above

History and Etymology for rad


radiation absorbed dose

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Cite this Entry

“Rad.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rad. Accessed 16 May. 2022.

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More Definitions for rad


\ ˈrad How to pronounce rad (audio) \

Medical Definition of rad

 (Entry 1 of 2)

: a unit of absorbed dose of ionizing radiation equal to an energy of 100 ergs per gram of irradiated material



Medical Definition of rad (Entry 2 of 2)

root used in writing prescriptions

History and Etymology for rad


Latin radix

More from Merriam-Webster on rad

Nglish: Translation of rad for Spanish Speakers

Britannica English: Translation of rad for Arabic Speakers

Britannica.com: Encyclopedia article about rad


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