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Related to vitamin P: vitamin E
A substance isolated from citrus rind that was thought to be a vitamin that reduced the permeability of capillaries. It was later determined to be a mixture of flavonoids.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl P vitamins
(Biochemistry) any of a group of water-soluble crystalline substances occurring mainly in citrus fruits, blackcurrants, and rosehips: they regulate the permeability of the blood capillaries. Also called: citrin or bioflavonoid
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
bi•o•fla•vo•noid(ˌbaɪ oʊˈfleɪ vəˌnɔɪd)
any of a group of water-soluble yellow compounds, present in citrus fruits, rose hips, and other plants, that in mammals maintain the resistance of capillary walls to permeation and change of pressure. Also called vitamin P.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.