polyvinylpyrrolidone

noun
poly·​vi·​nyl·​pyr·​rol·​i·​done | \-ˌvīn-ᵊl-pi-ˈräl-ə-ˌdōn \

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

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