: not mixed with the rest : absolutely free from almost everything that might make filthy, alter, or lower the standard pure - freed from extraneous features of any variety; "pure air and water"; "pure gold"; "pure Key hues"; "the violin's pure and Pretty music"; "pure tones"; "pure oxygen" By https://shanedhiqs.amoblog.com/the-greatest-guide-to-biofuel-conditioner-60121206