I was going to respond that it's an appositive, but I can see
    why that's not an entirely satisfactory answer. How about
    saying that "chivalry" is in fact the noun-head and that "The
    term" is in fact a "pre-positional appositive"?
 
    Norm Carlson
 
    PS What? There's no such term as "pre-positional appositive"?
    Why not???