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Entry 1 sense Webster, 1913

Rhamnus

· Rham·nus · IPA
01 n. A genus of shrubs and small trees; buckthorn. The California Rhamnus Purshianus and the European Rhamnus catharticus are used in medicine. …
  1. 1.
    A genus of shrubs and small trees; buckthorn. The California Rhamnus Purshianus and the European Rhamnus catharticus are used in medicine. The latter is used for hedges.(Bot.)