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• gray
  gray

  adjective

  of a color between white and black; having a neutral hue.
• Gray
  Gray

  noun

  Asa 1810–88, U.S. botanist.

gray

¹ American  

[grey] / greɪ /

especially British, grey

adjective

grayer, grayest

1. of a color between white and black; having a neutral hue.

2. dark, dismal, or gloomy.

   gray skies.

3. dull, dreary, or monotonous.

4. having gray hair; gray-headed.

5. pertaining to old age; mature.

6. Informal. pertaining to, involving, or composed of older persons.

   gray households.

7. old or ancient.

8. indeterminate and intermediate in character.

   The tax audit concentrated on deductions in the gray area between purely personal and purely business expenses.

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noun

1. any achromatic color; any color with zero chroma, intermediate between white and black.

2. something of this color.

3. gray material or clothing.

   to dress in gray.

4. an unbleached and undyed condition.

5. (often initial capital letter) a member of the Confederate army in the American Civil War or the army itself.

6. a horse of a gray color.

7. a horse that appears white but is not an albino.

verb (used with or without object)

1. to make or become gray.

gray ² American  

[grey] / greɪ /

noun

Physics.

1. the standard unit of absorbed dose of radiation (such as x-rays) in the International System of Units (SI), equal to the amount of ionizing radiation absorbed when the energy imparted to matter is 1 J/kg (one joule per kilogram). Gy

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Gray ³ American  

[grey] / greɪ /

noun

1. Asa 1810–88, U.S. botanist.

2. Robert, 1755–1806, U.S. explorer and sea captain: discovered the Columbia River.

3. Thomas, 1716–71, English poet.

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Gray ¹ British  

/ ɡreɪ /

noun

1. Thomas. 1716–71, English poet, best known for his Elegy written in a Country Churchyard (1751)

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gray ² British  

/ ɡreɪ /

noun

1.  Gy.  the derived SI unit of absorbed ionizing radiation dose or kerma equivalent to an absorption per unit mass of one joule per kilogram of irradiated material. 1 gray is equivalent to 100 rads

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gray ³ British  

/ ɡreɪ /

adjective

1. a variant spelling (now esp US) of grey

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gray Scientific  

/ grā /

1. The SI derived unit used to measure the energy absorbed by a substance per unit weight of the substance when exposed to radiation. One gray is equal to one joule per kilogram, or 100 rads. The gray is named after British physicist Louis Harold Gray (1905–1965).

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gray Idioms  

More idioms and phrases containing gray

• get gray hair from

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Usage

What’s the difference between gray and grey? Gray and grey are simply different spellings of the same word, which refers to the color halfway between black and white (among other more figurative meanings). In popular use, the two spellings are used interchangeably, though one spelling is often preferred in many places. The spelling gray is much more common in American English, while grey is more common in British English. Remember: spell gray with an a in America, and spell grey with an e in England (among other places). Want to learn more? Read the full breakdown of the difference between gray and grey.

Other Word Forms

• grayish
  adjective
• grayly
  adverb
• grayness
  noun
• ungrayed
  adjective

Etymology

Origin of gray¹

First recorded before 900; Middle English grei, grai, Old English grǣg, grēg; cognate with German grau, Old Norse grār

Origin of gray²

First recorded in 1975; named in honor of Louis Harold Gray (1905–65), English radiobiologist

Explanation

Because the color gray is between black and white — actually a mix of the two — it is often used to denote something dull or monotonous. When the sun comes out after a long stretch of gray days, you suddenly feel alive again. Everybody to the beach! You might feel old when you see your gray hairs, but I think they make you look wise and distinguished. Because gray is dull and indistinct, you can refer to something not quite clear as being "in a gray area." You often find some gray area between right and wrong . . . especially when you are accused of doing something wrong. Don’t worry about the British spelling "grey": it’s interchangeable with the American English spelling.

Example Sentences

According to outplacement firm Challenger, Gray & Christmas’s tally, announced job cuts in the tech sector ran 33% higher in the first four months of this year versus last year.

From The Wall Street Journal • May 9, 2026

As Gray worked with old, yellowing scans of Lee’s drawings in Photoshop, he accidentally inverted the colors.

From Los Angeles Times • May 8, 2026

“She asks for privacy at this time in protection of her young daughters,” the statement added, referring to Duff and Rosenberg’s two children, Ryan Ava Erhard, 10, and Lulu Gray, 7.

From MarketWatch • May 1, 2026

First-quarter layoffs totaled 217,362, according to outplacement firm Challenger, Gray & Christmas, a level 56% lower than the January-to-March period last year.

From The Wall Street Journal • Apr. 27, 2026

Gray Horse, in the western part of the territory, consisted of little more than a cluster of newly built lodges, and it was here where Lizzie and Ne-kah-e-se-y, who married in 1874, settled.

From "Killers of the Flower Moon" by David Grann

Related Words

• drab
• dusty
• silvery