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adulterant something that, when added to a substance, makes the substance impure or inferior. [1/2 definitions]
adulterate to make worse or impure by adding unnecessary or inferior ingredients. [2/3 definitions]
adulteration the act or process of adulterating, or making worse or impure by adding unnecessary or inferior ingredients. [1/3 definitions]
benzol an impure form of benzene, used in the chemical industry. [1/2 definitions]
cocktail2 a horse of mixed or impure breed. [1/2 definitions]
contaminate to make impure or unusable by contact or by adding a harmful substance.
culm1 shale or sandstone containing impure anthracite. [1/3 definitions]
impurity the state or condition of being impure. [1/2 definitions]
isolate in chemistry, to extract a pure substance from an impure one. [1/3 definitions]
pollutant something that pollutes, esp. a waste substance that makes air, water, or land impure or unhealthy; contaminant.
pollute to cause to become immoral or impure; taint. [1/3 definitions]
polluted made unclean, impure, unhealthy, or corrupt; contaminated.
purge to rid of anything impure or unwanted. [1/12 definitions]
salt cake impure sodium sulfate, used in the manufacture of paper pulps, soaps, detergents, dyes, and ceramic glazes.
scum impure matter that forms on the surface of a liquid. [1/5 definitions]
siderite a yellowish to light-brown impure iron ore; iron carbonate. [1/2 definitions]
stifle to suffer from having to breathe impure or hot air. [1/5 definitions]
unchaste impure or immodest, esp. in sexual conduct; not chaste.
unclean morally impure; unchaste. [2/3 definitions]