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catalyze to bring about or change, as a catalyst.
cocatalyst combined form of catalyst.
fuller's earth a very absorbent clay used esp. in fulling woolen cloth and also as a filter, dusting powder, catalyst, and the like.
mercury a chemical element that has eighty protons in each nucleus and that occurs as a dense silvery liquid at room temperature, used in thermometers, electrical devices, and reflecting surfaces, and as a catalyst; quicksilver. (symbol: Hg). [1/5 definitions]
nickel a chemical element that has twenty-eight protons in each nucleus and that occurs in pure form as a dense, hard, but malleable silver-white solid metal, used in alloys such as stainless steel and as a catalyst for various chemical reactions. (symbol: Ni). [1/4 definitions]
nitrogen dioxide a slightly toxic gas composed of nitrogen and oxygen, found in smog and automotive exhaust, and synthesized for use in nitration and oxidation, and as a catalyst.
osmium a chemical element that has seventy-six protons in each nucleus and that occurs as an octavalent ion or in pure form as an extremely hard, dense, brittle bluish metal solid used as a catalyst and esp. in alloys and in electron microscopy because of its extremely high density. (symbol: Os)
palladium a chemical element that has forty-six protons in each nucleus and that occurs in pure form as a dense, malleable, corrosion-resistant silver-white solid metal, used esp. as a catalyst and in alloys. (symbol: Pd)
pepsin an enzyme contained in gastric juice that serves as a catalyst in the digestion of most proteins. [1/2 definitions]
perchloric acid a strong acid of hydrogen, chlorine, and oxygen that is unstable in some conditions, is a powerful oxidizing agent, and is used as a catalyst and in explosives.
platinum a chemical element that has seventy-eight protons in each nucleus and that occurs in pure form as a dense, highly malleable, lustrous silvery white solid metal, used as a catalyst, in a variety of alloys, and in making jewelry. (symbol: Pt) [1/2 definitions]
rhenium a chemical element that has seventy-five protons in each nucleus and that occurs naturally only in compounds, but that can be isolated as a very dense metal, used esp. for electrical contacts and other high-temperature applications, and as a catalyst. (symbol: Re)
rhodium a chemical element that has forty-five protons in each nucleus and that occurs in pure form as a silvery-white, very corrosion-resistant metal, used esp. to electroplate instruments and jewelry and as a catalyst. (symbol: Rh)
ruthenium a chemical element that has forty-four protons in each nucleus and that occurs in pure form as a hard, white, dense metal solid used as a hardener in alloys or as a catalyst. (symbol: Ru)