I. ˌȯr-nə-ˈmen-t ə l adjective
Date: 1646
: of, relating to, or serving as ornament ; specifically : grown as an ornamental
• or·na·men·tal·ly -t ə l-ē adverb
II. noun
Date: 1650
: a decorative object ; especially : a plant cultivated for its beauty rather than for use