ra·​di·​al | \ ˈrā-dē-əl How to pronounce radial (audio) \

Definition of radial

 (Entry 1 of 2)

1 : arranged or having parts arranged like rays
2a : relating to, placed like, or moving along a radius
b : characterized by divergence from a center
3 : of, relating to, or adjacent to a bodily radius
4 : developing uniformly around a central axis



Definition of radial (Entry 2 of 2)

1a : a radial part
b : ray
2 : a body part (such as an artery) lying near or following the course of the radius
3 : a pneumatic tire in which the ply cords that extend to the beads are laid at approximately 90 degrees to the centerline of the tread

called also radial-ply tire, radial tire

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Other Words from radial


radially \ ˈrā-​dē-​ə-​lē How to pronounce radially (audio) \ adverb

Examples of radial in a Sentence

Adjective the radial form of a starfish
Recent Examples on the Web: Adjective Catonsville-Towson and Belair Road-Edmondson Avenue are radial routes extending from the central business district through the more densely populated parts of the city ... Jacques Kelly, baltimoresun.com, "Who killed Baltimore’s streetcar system?," 12 Sep. 2020 The original generator is now an alternator, Mederer has added an oil cooler, modern Sears radial tires have replaced original 6.70-by-15.0-inch bias-ply rubber, and ignition-wire shielding is missing in action. Don Sherman, Car and Driver, "Tested: 1962 Chevrolet Corvette vs 1982 Chevrolet Corvette," 31 Aug. 2020 No single supercharger had enough capacity to supply the 18-cylinder radial engines. Wayne Whittaker, Popular Mechanics, "Meet the B-29!," 15 June 2020 During the days of propeller airliners, the flight engineer was a specially qualified maintenance technician, due to the complexity of operating large radial engines. John Cox, USA TODAY, "Ask the Captain: Can severe turbulence tear the wing off a jetliner?," 26 June 2020 Earlier this year, a separate study announced that researchers used the radial velocity method to trace a signal likely belonging to a super-Earth also orbiting Proxima Centauri. Ashley Strickland, CNN, "Astronomers confirm Earth-size exoplanet around nearest star and maybe more," 4 June 2020 The roof and floors are built with a radial truss array that works like spokes on a bicycle wheel. Fox News, "Round homes and hurricanes: How circular design, emphasis on connections keep these structures standing," 27 May 2020 But when the researchers examined more precise subtypes of cells—a subset cells known as outer radial glia, for example—the comparisons started to break down. Kelly Servick, Science | AAAS, "Lab-grown ‘minibrains’ differ from the real thing in cell subtypes, gene expression," 29 Jan. 2020 Instead, bring up a radial menu to switch between gun options or temporarily remove the gun and free up your hand. Sam Machkovech, Ars Technica, "Half-Life: Alyx review: The greatest VR adventure game yet—and then some," 23 Mar. 2020 Recent Examples on the Web: Noun Instead only the most distal ones are homologous to digit bones; the proximal radials are homologous to the wrist bones and the long bones of the palm. John A. Long, Scientific American, "How a 380-Million-Year-Old Fish Gave Us Fingers," 20 May 2020 Enter the panda’s pseudo-thumb, which is also composed of an enlarged radial sesamoid and cartilaginous extension, and is controlled by the same three muscles as in the aye-aye. National Geographic, "This bizarre primate has a newly discovered digit," 21 Oct. 2019 Andretti first credits the slicks, and then changing from a cross-ply construction to radials. Tim Newcomb, Popular Mechanics, "Gaining Speed: A History of the Indy 500 Racing Tire," 24 May 2019 There’s a sort of radial set up to the room, that big gem in the middle was basically a topper on a giant, carpeted wedding cake, which seemed the ideal architecture for some sort of romantic ritual. Lucy Boyle, The Cut, "Farewell to the Most Sparkly Sacred Place in New York," 30 Oct. 2017 The bias ply is easier to retread while the radial is lighter. John Cox, USA TODAY, "Ask the Captain: How pilots respond to a blown tire," 22 Oct. 2017 Line lock helps the driver warm the rear drag radials, a special air-conditioning circuit chills the intercooler, and a trans brake makes for easy launches and helps the Demon perform the briefest of wheelies. Car and Driver, "New Cars for 2018: Chrysler, Dodge, and Ram," 10 Oct. 2017 The car comes on four drag radials, but the eight-speed ZF 8HP automatic turns only the rear wheels. K.c. Colwell, Car and Driver, "2018 Dodge Challenger SRT Demon," 20 July 2017 Of the more interesting highlights, a few involve the car’s specialized Nitto drag radials. Davey G. Johnson, Car and Driver, "Dodge Demands Owners Sign Waiver When Ordering Demon," 23 June 2017

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

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First Known Use of radial


1570, in the meaning defined at sense 1


1872, in the meaning defined at sense 1a

History and Etymology for radial


Medieval Latin radialis, from Latin radius ray

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Time Traveler for radial

Time Traveler

The first known use of radial was in 1570

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Statistics for radial

Last Updated

21 Sep 2020

Cite this Entry

“Radial.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radial. Accessed 24 Sep. 2020.

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More Definitions for radial


How to pronounce radial (audio)

English Language Learners Definition of radial

 (Entry 1 of 2)

: arranged or having parts arranged in straight lines coming out from the center of a circle



English Language Learners Definition of radial (Entry 2 of 2)

: a type of strong tire in which cords underneath the rubber run across the tire's surface


ra·​di·​al | \ ˈrād-ē-əl How to pronounce radial (audio) \

Medical Definition of radial

 (Entry 1 of 2)

1 : arranged or having parts arranged like rays
2 : of, relating to, or situated near the radius or the thumb side of the hand or forearm the radial aspect of the hand
3 : developing uniformly around a central axis radial cleavage of an egg

Other Words from radial

radially \ -​ē-​ə-​lē How to pronounce radially (audio) \ adverb



Medical Definition of radial (Entry 2 of 2)

: a body part (as an artery) lying near or following the course of the radius

More from Merriam-Webster on radial

Nglish: Translation of radial for Spanish Speakers

Britannica English: Translation of radial for Arabic Speakers

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