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Free from dirt, stain, or impurities; unsoiled.
(adjective)
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Free from foreign matter or pollution; unadulterated: clean air; clean drinking water.
(adjective)
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Not infected: a clean wound.
(adjective)
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Producing relatively little pollution: a clean fuel; a cleaner, more efficient engine.
(adjective)
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Producing relatively little radioactive fallout or contamination: a clean nuclear bomb.
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.