Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An element (such as carbon, hydrogen, oxygen, or nitrogen) or a nutrient (such as a protein, fat, or carbohydrate) required in large amounts for the normal growth and development of an organism.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any of the elements required in large amounts by all living things.

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