1. (

• gray ,
• grayness ,
• grey ,
• greyness

) a neutral achromatic color midway between white and black ;

2. (

• grey ,
• gray

) clothing that is a grey color; "he was dressed in grey" ;

3. (

• grey ,
• gray

) any organization or party whose uniforms or badges are grey; "the Confederate army was a vast grey" ;

4. (

• grey ,
• gray

) horse of a light gray or whitish color ;

5. (

• gray ,
• Gy

) the SI unit of energy absorbed from ionizing radiation; equal to the absorption of one joule of radiation energy by one kilogram of matter; one gray equals 100 rad ;

6. (

• Gray ,
• Louis_Harold_Gray

) English radiobiologist in whose honor the gray (the SI unit of energy for the absorbed dose of radiation) was named (1905-1965) ;

7. (

• Gray ,
• Thomas_Gray

) English poet best known for his elegy written in a country churchyard (1716-1771) ;

8. (

• Gray ,
• Robert_Gray

) American navigator who twice circumnavigated the globe and who discovered the Columbia River (1755-1806) ;

9. (

• Gray ,
• Asa_Gray

) United States botanist who specialized in North American flora and who was an early supporter of Darwin's theories of evolution (1810-1888) ;

1. (

• grey ,
• gray ,

) make grey; "The painter decided to grey the sky" ;

2. (

• grey ,
• gray

) turn grey; "Her hair began to grey" ;

1. (

• grey ,
• gray ,
• greyish ,
• grayish

) of an achromatic color of any lightness intermediate between the extremes of white and black; "the little grey cells"; "gray flannel suit"; "a man with greyish hair" ;

2. (

• grey ,
• gray ,
• grey-haired ,
• gray-haired ,
• grey-headed ,
• gray-headed ,
• grizzly ,
• hoar ,
• hoary ,
• white-haired

) showing characteristics of age, especially having grey or white hair; "whose beard with age is hoar"-Coleridge; "nodded his hoary head" ;

3. (

• grey ,
• gray

) used to signify the Confederate forces in the American Civil War (who wore grey uniforms); "a stalwart grey figure" ;

4. (

• grey ,
• gray

) intermediate in character or position; "a grey area between clearly legal and strictly illegal" ;