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

chemical

[′kem·i·kəl]
(chemistry)
Related to the science of chemistry.
A substance characterized by definite molecular composition.
References in periodicals archive ?
CONTEXT: We report on two patients, a 23-year-old man and a 24-year-old man, who had chemical pneumonitis and respiratory distress after inhaling hexachloroethane/zinc oxide (HC/ZnO) smoke during military training.
Paraffin causes a chemical pneumonitis due to aspiration, either during ingestion, after vomiting, or silently.
There were 124 paraffin poisonings with 2 deaths; one died of aspiration pneumonitis and the other, an HIV-positive patient with extensive chemical pneumonitis, developed septic shock.