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Definition of Citrin
1. Noun. A vitamin that maintains the resistance of cell and capillary walls to permeation.
Definition of Citrin
1. a citric vitamin [n -S]
Medical Definition of Citrin
1. A mixture of bioflavonoids extracted from plants (especially citrus fruits). It reduces the permeability and fragility of capillaries and is useful in the treatment of certain cases of purpura that are resistant to vitamin C therapy. See: hesperidin, quercetin, rutin. Synonym: capillary permeability factor, citrin, permeability vitamin. (05 Mar 2000)