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atom (physics and chemistry) the smallest component of an element having the chemical properties of the element compound (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight element an artifact that is one of the individual parts of which a composite entity is made up molocule is a particle made up of 2 or more atoms thermal energy (heat) kinetic energy associated with the random movement of atoms or molecules organic compound made of carbon atoms bonded to other atom's enzyme any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions saliva a clear liquid secreted into the mouth by the salivary glands and mucous glands of the mouth digestion the organic process by which food is converted into substances that can be absorbed into the body