| gray | (adjective) of an achromatic color of any lightness intermediate between the extremes of white and black | Synonyms: grayish, grey, greyish |
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| (adjective) intermediate in character or position | Synonyms: grey |
| (adjective) showing characteristics of age, especially having grey or white hair | Synonyms: gray-haired, gray-headed, grey-haired, grey-headed, grey, grizzly, hoar, hoary, white-haired |
| (adjective) used to signify the Confederate forces in the American Civil War (who wore grey uniforms) | Synonyms: grey |
| (noun) horse of a light gray or whitish color | Synonyms: grey |
| (noun) clothing that is a grey color | Synonyms: grey |
| (noun) a neutral achromatic color midway between white and black | Synonyms: grayness, grey, greyness |
| (noun) any organization or party whose uniforms or badges are grey | Synonyms: grey |
| (noun) 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 | Synonyms: Gy |
| (verb) turn grey | Synonyms: grey |
| (verb) make grey | Synonyms: grey |
| grayback | (noun) a dowitcher with a grey back | Synonyms: greyback, Limnodromus griseus |
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| (noun) a sandpiper that breeds in the Arctic and winters in the Southern Hemisphere | Synonyms: Calidris canutus, greyback, knot |
| graybeard | (noun) a man who is very old | Synonyms: greybeard, Methuselah, old man |
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| grayhen | (noun) female black grouse | Synonyms: gray hen, grey hen, greyhen, heath hen |
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| grayish | (adjective) of an achromatic color of any lightness intermediate between the extremes of white and black | Synonyms: gray, grey, greyish |
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| graylag | (noun) common grey wild goose of Europe; ancestor of many domestic breeds | Synonyms: Anser anser, graylag goose, greylag, greylag goose |
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| grayly | (adverb) having a grey appearance | Synonyms: greyly |
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| grayness | (noun) a neutral achromatic color midway between white and black | Synonyms: gray, grey, greyness |
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