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air the mixture of gases that surrounds the earth. Air is made up of oxygen, nitrogen, and other gases, and has no taste, odor, or color. [1/6 definitions]
ammonia the gas with a strong smell that is formed by combining nitrogen and hydrogen. Ammonia is used to make refrigerators cold and in making fertilizers. [1/2 definitions]
N1 symbol of the chemical element nitrogen.
nitrogen a gas with no color or smell that is one of the chemical elements. Nitrogen makes up about eighty percent of the earth's atmosphere, and it is also found in all living things. (symbol: N)
protein a substance that is made up of nitrogen, carbon, oxygen, hydrogen, and possibly other elements. Proteins are found in all living things and are a necessary part of life processes.