marrowbone

/ˈmɛroʊˌboʊn/
noun
  1. A bone containing marrow, especially one used in cooking for flavor or as a food source.
    • My grandmother always added a marrowbone to her soup for extra flavor.
    • The butcher gave us a few marrowbones for our dog to chew on.
    • The chef roasted marrowbones and served the rich marrow on toast.