say it: awr-nuh-MEN-tuhl
ornamental is a noun and adjective meaning "any plant grown for its beauty or ornamental value". It carries 2 recorded senses.
any plant grown for its beauty or ornamental value
serving an esthetic rather than a useful purpose
“cosmetic fenders on cars”
“the buildings were utilitarian rather than decorative”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for ornamental come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.