: a genus (family Rhamnaceae) of trees and shrubs that have small flowers and a fruit which is a drupe and that comprise the buckthorns of which some yield pigments (such as R. saxatilis) or purgatives (such as R. cathartica)
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“Rhamnus.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Rhamnus. Accessed 15 Nov. 2025.
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