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trace element |
Also found in: Dictionary/thesaurus, Medical, Legal, Encyclopedia, Wikipedia | 0.07 sec. |
trace elementChemical element necessary in minute quantities for the health of a plant or animal. For example, magnesium, which occurs in chlorophyll, is essential to photosynthesis, and iodine is needed by the thyroid gland of mammals for making hormones that control growth and body chemistry. |
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