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Trace el·e·ment

/trās ˈeləmənt/

noun
- 1. a chemical element present only in minute amounts in a particular sample or environment.
- ▪ a chemical element required only in minute amounts by living organisms for normal growth.
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Trace element
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A trace element is a chemical element of a minute quantity, a trace amount, especially used in referring to a micronutrient, but is also used to refer to minor elements in the composition of a rock, or other chemical substance. In nutrition, trace elements are classified into two groups: essential trace elements, and non-essential trace elements. Essential trace elements are needed for many physio... Wikipedia
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