On`a*gra"ceous (?), On`a*gra*ri"e*ous (?), a. [From NL. Onagra an old scientific name of the evening primrose (Enothera), fr. Gr. a kind of plant; of uncertain origin.] Bot.
Pertaining to, or resembling, a natural order of plants (Onagraceae or Onagrarieae), which includes the fuchsia, the willow-herb (Epilobium), and the evening primrose ().
© Webster 1913.