1) (usually of hair) reddish-brown (auburn)

2) (a kind of, wood of) a tree with smooth, bright reddish-brown nuts (some being edible) (chestnut)

3) a common reddish-brown metal (symbol Cu) (copper)

4) (a kind of bush producing) a reddish-brown dye for colouring the hair etc (henna)

5) the large, reddish-brown organ in the body which produces bile and cleans the blood (liver)

6) a small reddish-brown bird that sings sweetly at night (nightingale)

7) reddish-brown (colour) (russet)

8) the reddish-brown coating formed on iron etc by the action of water and air (rust)