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Freebase(0.00 / 0 votes)Rate this definition: Nutrient. A nutrient is a chemical that an organism needs to live and grow or a substance used in an organism's metabolism which must be taken in from its environment. They are used to build and repair tissues, regulate body processes and are converted to and used as energy.
Nutrients â the Fuel of Life. Nutrients are chemical elements that all plants and animals require for growth. On the earth, there is a constant and natural cycle how these elements are incorporated when an organism grows, and degraded if an organism dies.