| additive | 1. <chemistry> Characterised by addition. 2. A substance, as a flavouring agent, preservative or vitamin, added to another substance to improve its appearance, increase its nutritional value, etc. (18 Nov 1997) |
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| additive effect | <biochemistry, chemistry> An additive effect is the overall biological effect two chemicals acting together and which is the simple sum of the effects of the chemicals acting independently. Compare: antagonism. (15 Jan 1998) |
| additive model | A model in which the combined effect of several factors is the sum of the effects that would be produced by each of the factors in the absence of the others. (05 Mar 2000) |