polyvalent allergy n.
Hypersensitivity that occurs simultaneously to several specific antigens.
- Polyvalent serum
polyvalent serum n. An antiserum obtained from an animal that has been inoculated with several species or strains of a bacterium.
- Polyvalent vaccine
polyvalent vaccine n. A vaccine prepared from cultures of two or more strains of the same species of microorganism or virus. Also called multivalent vaccine.
polyphrasia pol·y·phra·si·a (pŏl’ĭ-frā’zē-ə, -zhə) n. Extreme talkativeness.
- Polyphosphoric acid
/ˌpɒlɪfɒsˈfɒrɪk/ noun 1. any one of a series of oxyacids of phosphorus with the general formula Hn+2PnO3n+1. The first member is pyrophosphoric acid (n = 2) and the series includes the highly polymeric metaphosphoric acid. The higher acids exist in an equilibrium mixture 2. a glassy or liquid mixture of orthophosphoric and polyphosphoric acids: used […]