the basic unit of an absorbed dose of radiation in the SI system, equal to the absorption of one joule of energy per kilogram of material (100 rads): abbrev. Gy
Gray,
Asa 1810-88; U.S. botanist
Gray,
Thomas 1716-71; Eng. poet
See gray in American Heritage Dictionary 4
also grey(grā)
adjectivegray·er also grey·er, gray·est also grey·est
Of or relating to an achromatic color of any lightness between the extremes of black and white.
a. Dull or dark: a gray, rainy afternoon.
b. Lacking in cheer; gloomy: a gray mood.
a. Having gray hair; hoary.
b. Old or venerable.
Intermediate in character or position, as with regard to a subjective matter: the gray area between their differing opinions on the film's morality.
noun
An achromatic color of any lightness between the extremes of black and white.
An object or animal of the color gray.
often Gray
a. A member of the Confederate Army in the Civil War.
b. The Confederate Army.
verbgrayed also greyed, gray·ing also grey·ing, grays also greys verb, transitive
To make gray.
verb, intransitive
To become gray.
a. To become old; age.
b. To include a large or increasing proportion of older people: “Federal food programs can't keep up with the nation's rapidly graying population”(Michael J. McCarthy).
Related Forms:
grayˈly adjective
grayˈness noun
(grā)
noun Abbr. Gy
The SI unit for the energy absorbed from ionizing radiation, equal to one joule per kilogram.
(grā), Asa 1810-1888.
American botanist who greatly enlarged and improved the description of North American flora and was the chief American advocate of Charles Darwin's theories.
, Robert 1755-1806.
American explorer who twice circumnavigated the globe (1787-1790 and 1790-1793) and discovered Grays Harbor and the Columbia River (1792).
, Thomas 1716-1771.
British poet considered a forerunner of English romanticism. His most famous work is Elegy Written in a Country Churchyard (1751).