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chemical

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chemical

any substance used in or resulting from a reaction involving changes to atoms or molecules, especially one derived artificially for practical use
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

chemical

[′kem·i·kəl]
(chemistry)
Related to the science of chemistry.
A substance characterized by definite molecular composition.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
After 4 weeks, the patient was discharged to a long-term-care facility on supplemental oxygen because his chemical pneumonitis was not fully resolved.
Chemical pneumonitis due to exposure to bromine compounds.
They acknowledged the longer delay between exposure and disease manifestations compared with other causes of acute chemical pneumonitis, but they did not offer an explanation for this discrepancy (Sterner and Eisenbud 1951).
He was transferred to another facility, where he was diagnosed with hydrocarbon ingestion with chemical pneumonitis. Keimer died a month later.
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