Of grey colour, grey, grizzled. †Formerly also, of a horse: Roan.

Grey, grizzly; now used almost exclusively of hair. Also (now dialect), roan-coloured.

Of a horse: roan, roan-coloured. Also in extended use, of other animals or their coats.

In extended use, of a thing or its colour: dull or pale red. Now rare.

(a) adj. designating an animal (esp. a horse) having a coat with black and white hairs evenly mixed, giving it a blue-grey colour (occasionally also…

With reference to a horse: a pale dull reddish colour (see roan, n.4 2.). Also as adj.