When two toxic agents acting together have an effect greater than the sum of their individual effects.
A violation of value-additivity in that the value of a combination is greater than the sum of the individual values.
A violation of value-additivity whereby the value of the combination is greater than the sum of the individual values. 
The interaction of two or more drugs such that their combined effect is greater than the sum of the individual effects when each drug is administered alone.
A group of banks that acts jointly, on a temporary basis, to loan money in a bank credit (syndicated
A biologic response to multiple substances where one substance worsens the effect of another substan
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.
the added effect produced by two processes working in combination. It is greater than the sum of the individual 
Type: Term Synonyms: synergism