The effect produced when two or more factors, operating jointly, is greater then the sum of their effects when operating independently. Synergist

A chemical which improves the effectiveness of another chemical. Thus piperonyl butoxide is a synergist of natural pyrethrins. The pyrethrins alone have a 'knock down' effect, but the insects are likely to recover. When the pyrethrins are used with an appropriate synergist, however, the insects are killed. Synonym

In taxonomy, an alternative name. Synthetic chemicals

The artificial production of chemical compounds. The definition of organic farming is that it uses no synthetic chemicals. That is, it uses no artificial fertilisers, no synthetic herbicides, no synthetic insecticides, and no synthetic fungicides. However, it may use natural chemicals, such as rock phosphate, natural pyrethrins, etc.

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