Webster's English Dictionary

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ornamental

1. or.na.men.tal \.o.r-n*-'ment-*l\ \-*l-e-\ aj : of, relating to, or 
   serving as ornament; specif : grown as an o rnamental - or.na.men.tal.ly av
2. ornamental n : a decorative object; esp : a plant cultivated for its 
   beauty rat her than for use