noun
noun plural P vitamins
- any of a group of water-soluble crystalline substances occurring mainly in citrus fruits, blackcurrants, and rosehips: they regulate the permeability of the blood capillariesAlso called: citrin, bioflavonoid
n.
- A water-soluble vitamin, found as a crystalline substance especially in citrus juices, that functions as a bioflavonoid in promoting capillary resistance to hemorrhaging.capillary permeability factor