Synergistic Effect 3 : A synergistic effect is the any effect of two chemicals acting together which is greater than the simple sum of their effects when acting alone: such chemicals are said to show synergism
Heriot-Watt University, School of Life Sciences, Some Terms Used In Toxicology and Chemical Safety, Edinburgh, UK 1992. http://www.who.int/ipcs/publications/methods/harmo nization/en/compilation_nov2001.pdf, (Tox and Chem Sfty - Amer) {85}