正せい触しょく媒ばいせいしょくばいMeanings1nounpositive catalystTechnical term in chemistry for a catalyst that increases the rate of a reaction. Contrasts with 負触媒 (negative catalyst/inhibitor).See also: 負触媒この反はん応のうでは正せい触しょく媒ばいとして白はっ金