definition of gray From The American Heritage® Dictionary of the English Language, 5th Edition
GRAY
grā
ADJECTIVE
1 . Of or relating to an achromatic color of any lightness between the extremes of black and white.
2 . Dull or dark.
3 . Lacking in cheer; gloomy.
4 . Having gray hair; hoary.
5 . Old or venerable.
6 .Intermediate in character or position, as with regard to a subjective matter.
NOUN
1 . An achromatic color of any lightness between the extremes of black and white.
2 . An object or animal of the color gray.
3 . A member of the Confederate Army in the Civil War.
4 . The Confederate Army.
5 . The SI unit for the energy absorbed from ionizing radiation, equal to one joule per kilogram.
INTRANSITIVE VERB
1 . To make gray.
2 . To become gray.
3 . To become old; age.
4 . To include a large or increasing proportion of older people.