| ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷+ noun
Etymology: poly- + vinyl + pyrrolidone
: a water-soluble chemically inert solid polymer (−CH 2 CHC 4 H 6 NO−) n made by polymerization of N -vinyl-pyrrolidone and used chiefly in medicine as a vehicle for drugs (as iodine) and especially formerly as a plasma expander