Chemical
chemical Audio
chem·i·cal [ kem-i-kuhl ]
Definitions related to chemicals:
  • A substance made up of elements, such as hydrogen or sodium.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • A substance with a defined atomic or molecular structure that results from, or takes part in, reactions involving changes in its structure, composition, or properties.
    NCI
    U.S. National Cancer Institute, 2021
  • Tree section heading for terms covering drugs, reagents, biomolecules, and other chemical compounds.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • (chemical substance) A substance that is fully defined by an organic or inorganic chemical formula, includes mixtures of other chemical substances. Refine using, e.g., IUPAC codes.
    NCI Health Level 7 Vocabulary
    U.S. National Cancer Institute, 2018
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.