gray

1

or grey

[ grey ]
/ greɪ /

adjective, gray·er, gray·est.

noun

verb (used with or without object)

to make or become gray.

Origin of gray

1
before 900; Middle English; Old English grǣg; cognate with German grau

Related forms

gray·ly, adverbgray·ness, nounun·grayed, adjective

Definition for gray (2 of 3)

gray

2
[ grey ]
/ greɪ /

noun Physics.

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). Abbreviation: Gy
Compare rad.

Origin of gray

2
First recorded in 1975; named in honor of Louis Harold Gray (1905–65), English radiobiologist

Definition for gray (3 of 3)

Gray

[ grey ]
/ greɪ /

noun

A·sa [ey-suh] /ˈeɪ sə/, 1810–88, U.S. botanist.
Robert,1755–1806, U.S. explorer and sea captain: discovered the Columbia River.
Thomas,1716–71, English poet.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for gray

British Dictionary definitions for gray (1 of 3)

gray

1
/ (ɡreɪ) /

adjective, noun, verb

a variant spelling (now esp US) of grey

Derived Forms

grayish, adjectivegrayly, adverbgrayness, noun

British Dictionary definitions for gray (2 of 3)

gray

2
/ (ɡreɪ) /

noun

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 radsSymbol: Gy

Word Origin for gray

C20: named after Louis Harold Gray (1905–65), English physicist

British Dictionary definitions for gray (3 of 3)

Gray

/ (ɡreɪ) /

noun

Thomas. 1716–71, English poet, best known for his Elegy written in a Country Churchyard (1751)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for gray (1 of 2)

gray

[ grā ]

n.

A unit for a specific absorbed dose of radiation equal to 100 rads.

Medicine definitions for gray (2 of 2)

Gray

Henry 1825?-1861

British anatomist whose work Anatomy, Descriptive and Surgical (1858), known as Gray's Anatomy, remains a standard text.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for gray

gray

[ grā ]

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).
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with gray

gray


In addition to the idioms beginning with gray

  • gray area
  • gray matter

also see:

  • get gray hair from
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.