Definitions of gray:

• noun:   horse of a light grey or whitish color
• noun:   gray clothing

  Example: "He was dressed in gray"

• noun:   a neutral achromatic color midway between white and black
• noun:   any organization or party whose uniforms or badges are gray

  Example: "The Confederate army was a vast gray"

• noun:   United States botanist who specialized in North American flora and who was an early supporter of Darwin's theories of evolution (1810-1888)
• noun:   American navigator who twice circumnavigated the globe and who discovered the Columbia River (1755-1806)
• noun:   English poet best known for his elegy written in a country church-yard (1716-1771)
• verb:   turn gray

  Example: "Her hair began to gray"

• verb:   make gray
• adjective:   used to signify the Confederate forces in the Civil War (who wore gray uniforms)

  Example: "A stalwart gray figure"

• adjective:   showing characteristics of age, especially having gray or white hair
• adjective:   an achromatic color of any lightness between the extremes of black and white

  Example: "Gray flannel suit"

• adjective:   intermediate in character or position

  Example: "A gray area between clearly legal and strictly illegal"

• adjective:   darkened with overcast

  Example: "A gray rainy afternoon"

• name:  A surname (very common: 1 in 943 families; popularity rank in the U.S.: #69)