Definition of "grey"

These grey and dun colors may be also produced by mixing whites and blacks.

1704, I[saac] N[ewton], “(please specify |book=1 to 3)”, in Opticks: Or, A Treatise of the Reflexions, Refractions, Inflexions and Colours of Light. […], London: […] Sam[uel] Smith, and Benj[amin] Walford, printers to the Royal Society, […]

Now only a few hand-hewn cedar planks and roof beams remained, moss-grown and sagging—a few totem poles, greyed and split.

1941, Emily Carr, chapter 18, in Klee Wyck‎

Woe worth the chase, woe worth the day, / That costs thy life, my gallant grey.

1810, Walter Scott, “(please specify the canto number or page)”, in The Lady of the Lake; […], Edinburgh: […] [James Ballantyne and Co.] for John Ballantyne and Co.; London: Longman, Hurst, Rees, and Orme, and William Miller, (please specify the stanza number)

Pioneer seemed now to have the game in his own hands; but the Captain, by taking two desperate leaps, cut off a corner, by which he regained the ground he had lost by the fall, and was up with the grey the remainder of the chase.

1833, Sporting Magazine, volume 6, page 400