(Latin “different kinds”).Any mixture or solution comprised of two or more substances regardless of whether they are uniformly dispersed. Common examples are such diverse materials as air (a mixture of 20% oxygen and 80% nitrogen), milk, marble, paint, gasoline, blood and mayonnaise. In all such cases, the mixtures can be separated mechanically into their components. “Homogenized” milk is as heterogeneous as regular milk and the term is, strictly speaking, a misnomer.See Homogeneous; Mixture.