or·na·men·tal /ˌɔrnəˈmɛntḷ/
  裝飾物(a.)裝飾性的,裝飾的,裝飾用的
  or·na·men·tal a.  Serving to ornament; characterized by ornament; beautifying; embellishing.
     Some think it most ornamental to wear their bracelets on their wrists; others, about their ankles.   --Sir T. Browne.
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  ornamental
       adj : serving an esthetic rather than a useful purpose; "cosmetic
             fenders on cars"; "the buildings were utilitarian
             rather than decorative" [syn: cosmetic, decorative]
       n : any plant grown for its beauty or ornamental value