ornamental UK /ˌɔː.nəˈmɛn.təl/US /ˌɔɹ.nəˈmɛn.təl/adjective 2noun 1forms 3 adjective2 •Serving as an ornament; having no purpose other than to make more beautiful.Some think it most ornamental to wear their bracelets on their wrists; others, about their ankles. •Bred for aesthetic or decorative purposes.Those cranberry bushes are ornamental, so they're not edible. noun1 •An ornamental plant.The tumbleweed is a gracious gift from the Russians, having been imported as a favored ornamental from the steppes of central Asia. — 1991 formsornamentals · more ornamental · most ornamental