Discolored or stained; said of timber, and also of the paper of books or engravings
{s} tricked; deceived; cheated; stained or spotted with yellowish brown color (due to age); (relating to specimens of birds and mammals in museums) having melanin pigments that have oxidized to a reddish brown color with age
Discolored with yellowish-brown stains: "Their set of George Eliot was foxed and buckled by the rain" (John Cheever)