rad
Rad means excellent, cool, or impressive and is a shortened form of radical.
By Cal Hewitt, Gen X · Researched from public sources ·
What it actually means
Rad is a compact compliment with a strong 1980s surf and skate flavor. It can still be sincere, but it is also often used with nostalgia or self-aware retro style. It should not be confused with the medical noun rad, a radiation-dose unit, or with radical in its political sense.
See the quick definition in the rad dictionary entry.
Where it came from
Merriam-Webster defines rad as slang for cool or radical and dates its adjective use to 1978. Etymonline dates the teenage-slang sense to the late 1970s. Merriam-Webster’s history of radical cites Green’s Dictionary of Slang for the excellent or cool sense of radical arising in surfer jargon in the 1960s. The exact person who shortened radical to rad is not documented.
No single person is credited, the origin is commonly reported.
Where it's popular
The positive sense is tied to surfer jargon and later to wider U.S. teenage slang, with strong California and 1980s associations.
Surf culture shares this vocabulary with terms such as radical and gnarly.
How it caught on
- 14th centuryMerriam-Webster traces radical to Late Latin radicalis and Latin radix, meaning root.
- 1960sMerriam-Webster reports that the excellent or cool sense of radical originated in surfer jargon.
- late 1970sEtymonline dates rad as teenage slang for excellent or wonderful.
- 1978Merriam-Webster records the adjective rad in its slang sense.
- 1980sRad circulated with California-associated surf and youth slang.
How to use it
“That mural is rad.”
A casual compliment for art or design.
“We found a rad little bookstore downtown.”
Warm approval with a retro flavor.
“That was a rad save.”
Praise for a skillful move in a game or sport.
Common mix-ups
Rad is not always slang. Rad can also be a unit of radiation dose, and radical has political, mathematical, medical, and root-related meanings.
Do you actually know it?
How rad is your recall?
0/31. What is rad usually short for in slang?
2. Which community is tied to the earlier cool sense of radical?
3. When did Merriam-Webster record rad as a slang adjective?
Related slang
Questions people ask
What does rad mean in slang?
It means cool, excellent, or impressive.
Is rad short for radical?
Yes. Dictionaries define the slang adjective as cool or radical, and its history runs through the positive slang use of radical.
Where did rad come from?
The teen-slang form emerged in the late 1970s, with the related positive radical sense linked to surfer jargon in the 1960s.
Does rad mean radiation?
It can. In technical use, rad is also a unit of absorbed radiation dose, which is unrelated to the slang adjective.
Rad entered slang after radical had already developed a cool sense in surfer jargon, while the technical word rad had an entirely different history as a radiation unit.
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