Secondary metabolites are organic compounds that are not directly involved in the normal growth, development or reproduction of organisms.
Secondary metabolites, also known as natural products, are those products (chemical compounds) of metabolism that are not essential for normal growth, development or reproduction of an organism. In this sense they are "secondary".
Secondary Metabolites in Plants - Biology Encyclopedia forum
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What are secondary metabolites?
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The genes encoding cytochrome P450 monooxygenases (P450s) and glutathione S-transferases (GSTs) are members of the major multigene enzyme families that are primarily responsible for detoxification of xenobiotic compounds, for example, insecticides and plant secondary metabolites ,.
primary metabolite is essential for normal growth, development, and reproduction. A secondary metabolite is not essential for normal growth, development and reproduction, but usually has important ecological functions. Examples include antibiotics and pigments.
Third, this definition places a heavy, though not exclusive, emphasis on morphological characters. It also recognizes phenetic characters such as chromosome number, chromosome morphology, cell ultrastructure, secondary metabolites, habitats and other features.
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secondary product Chemical compounds synthesized by plants or fungi but not critical for the basic metabolic functions of that organism; often functioning to deter predators or attract pollinators; a secondary metabolite.
See also: What is the meaning of Plant, Biology, Organ, Character, Animal?