Definitions of roan:

• noun:   horse having a roan coat
• noun:   a soft sheepskin leather that is colored and finished to resemble morocco; used in bookbinding
• adjective:   (used of especially horses) having a brownish coat thickly sprinkled with white or gray

  Example: "A roan horse"

• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #9642)