Noun

1. A neutral achromatic color midway between white and black
2. Clothing that is a grey color
3. Any organization or party whose uniforms or badges are grey
4. Horse of a light gray or whitish color
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
6. English radiobiologist in whose honor the gray (the si unit of energy for the absorbed dose of radiation) was named (1905-1965)
7. English poet best known for his elegy written in a country churchyard (1716-1771)
8. American navigator who twice circumnavigated the globe and who discovered the columbia river (1755-1806)
9. United states botanist who specialized in north american flora and who was an early supporter of darwin's theories of evolution (1810-1888)

Verb

1. Make grey
2. Turn grey