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Children's Dictionary
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]
carbon dioxide a gas without color or odor that is made up of carbon and oxygen. Carbon dioxide is in the air and is used in soft drinks. Frozen carbon dioxide is called dry ice.
fume (often plural) a vapor, smoke, or odor that is not pleasant or healthy. [1/2 definitions]
odour a spelling of "odor" used in Canada and Britain. See "odor" for more information.
perfume a pleasant odor. [2/3 definitions]
smell to sense the odor of by means of the nose. [4/8 definitions]
sniff to smell an odor with short breaths through the nose. [1/4 definitions]
tang a sharp, strong flavor or odor.
water a clear liquid that has no taste or odor. Water takes the form of rain, rivers, oceans, and lakes and is a requirement for most forms of life. [1/6 definitions]