gray in WordNet English dictionary

1. horse of a light gray or whitish color
   grey  gray 
   
2. clothing that is a grey color
   "he was dressed in grey"
   grey  gray 
   
3. a neutral achromatic color midway between white and black
   gray  grayness  grey  greyness 
   
4. any organization or party whose uniforms or badges are grey
   "the Confederate army was a vast grey"
   grey  gray 
   
5. 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
   gray  Gy 
   

1. turn grey
   "Her hair began to grey"
   grey  gray 
   
2. make grey
   "The painter decided to grey the sky"
   grey  gray 
   

1. 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"
   grey  gray  greyish  grayish 
   
2. intermediate in character or position
   "a grey area between clearly legal and strictly illegal"
   grey  gray 
   
3. showing characteristics of age, especially having grey or white hair
   "whose beard with age is hoar"-Coleridge; "nodded his hoary head"
   grey  gray  grey-haired  gray-haired  grey-headed  gray-headed  grizzly  hoar  hoary  white-haired 
   
4. used to signify the Confederate forces in the American Civil War (who wore grey uniforms)
   "a stalwart grey figure"
   grey  gray