an additional ingredient that is added by mixing with the base; "the growing medium should be equal parts of sand and loam with an admixture of peat moss and cow manure"; "a large intermixture of sand"
Admixture means the same as mixture. an admixture of fact and fantasy. = mixture. a substance that is added to another substance in a mixture (admixtus, past participle of admiscere, from ad- + miscere )