{ On′a‐gra″ceous (ŏn′ȧ‐grā″shŭs), On′a‐gra‐ri″e‐ous (–grā̍‐rī″ē̍‐ŭs), } a. [From NL. Onagra an old scientific name of the evening primrose (Œnothera), fr. Gr. ονἄγρα 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).
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.