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Ac symbol of the chemical element actinium.
acetate a chemical compound derived from acetic acid. [1/2 definitions]
acetone a chemical compound, highly volatile and flammable, used in making compounds and as a solvent, as in paints.
acid rain rain that has high acidity because of being mixed with pollutants such as vehicle exhausts and residues from burning of fossil fuels for energy or from chemical manufacturing.
actinic of or pertaining to the chemical property of ultraviolet radiation and x-rays that produces photochemical effects.
actinide any of the chemical elements of the actinide series.
actinide series the series of chemical elements, mostly synthetic and all radioactive, that have from eighty-nine to 103 protons per atom.
actinism the property of radiation that produces chemical activity.
actinium a radioactive chemical element of the rare-earth group that has eighty-nine protons in each nucleus. (symbol: Ac)
actinogen any of the radioactive chemical elements.
active having effect or able to produce effect, as a chemical. [1/6 definitions]
aerate to expose to the circulation or chemical action of air in order to ventilate or cleanse. [1/3 definitions]
affinity a chemical attraction or force that causes certain elements to combine with certain others. [1/5 definitions]
Ag symbol of the chemical element silver.
agrochemical a chemical used to enhance the quality and increase the quantity of farm produce. [2 definitions]
Al symbol of the chemical element aluminum.
alchemy an ancient exploration and practice of chemistry which flourished particularly during medieval times. Practitioners used chemical processes in the hope of, for example, producing gold from base metals, finding the key to eternal life, and uncovering a single cure for all disease. [1/2 definitions]
aliphatic indicating an organic chemical compound in which the carbon atoms make an open chain.
alizarin a reddish orange or brownish orange chemical substance from which dyes are made.
alkali metal any of a group of highly reactive chemical elements, such as sodium and potassium, that are typically univalent cations forming various compounds, but that can be isolated as soft, low-density metals.
alkaline-earth metal any of a group of highly reactive chemical elements, such as calcium and magnesium, that are typically divalent cations and form compounds with various other elements.