{ On`a*gra"ceous (&obreve;n`&adot;*grā"shŭs), On`a*gra*ri"e*ous (-gr&asl;*rī"&esl;*ŭs), } a. [From NL. Onagra an old scientific name of the evening primrose (Œnothera), fr. Gr. 'ona`gra a kind of plant; of uncertain origin.] (Bot.) Pertaining to, or resembling, a natural order of plants (Onagraceæ or Onagrarieæ), which includes the fuchsia, the willow-herb (Epilobium), and the evening primrose (Œnothera).