polyvinylpyrrolidone
noun
poly·vi·nyl·pyr·rol·i·done
| \ -ˌvīn-ᵊl-pi-ˈräl-ə-ˌdōn
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Medical Definition of polyvinylpyrrolidone
: a water-soluble chemically inert solid polymer (−CH2CHC4H6NO−)n used chiefly in medicine as a vehicle for drugs (as iodine) and especially formerly as a plasma expander
— called also povidone