vitamin p: a vitamin that maintains the resistance of cell and capillary walls to permeation
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
acquired immunity: immunity to a particular disease that is not innate but has been acquired during life; immunity can be acquired by the development of antibodies after an attack of an infectious disease or by a pregnant mother passing antibodies through the placenta to a fetus or by vaccination