Definition of "ochrous"

Ahead of us was a great ochreous depression over which a shifting heat haze trembled looking almost like blue smoke.

1958, Henno Martin, translated by Edward Fitzgerald, The Sheltering Desert, Thomas Nelson & Sons, page 17

[…] they looked around for a refreshment tent among the many which dotted the down. Two, which stood nearest to them in the ochreous haze of expiring sunlight, seemed almost equally inviting.

1886, Thomas Hardy, chapter I, in The Mayor of Casterbridge‎

The Lutheran Church across the way, which in the daylight was the color of baby shit, had now taken on a soft ochrous hue which blended serenely with the black of the asphalt.

1949, Henry Miller, chapter 23, in The Rosy Crucifixion, Book One: Sexus, New York: Grove Press, published 1965, page 498

It was a Saturday, one of those dusty, ocherous autumnal days whose vivid weather never again seems so sweet and inviting after that youthful time of discovery [...].

1967, William Styron, The Confessions of Nat Turner, Vintage, published 2004, page 179