(of hair or feathers) of brown tinged with chestnut(adjective)
WordNet. Princeton University. 2010.
Use "chestnut-brown" in a sentence
"The horse is tall and chestnut-brown; the rider is still harboring a secret."
"She's petite, cute as a button, with a sleek chestnut-brown ponytail that gets twisted up under a bandanna when she whips out the clay."
"His hair was chestnut-brown, glinting in the candle-light to gold, and the hint of waviness in it explained the perceptible droop to his tawny moustache."