Cell or Molecular Dysfunction
trisomy Audio
tri·so·my [ trahy-soh-mee ]
Subclass of:
Chromosomal Duplication; Aneuploidy
Definitions related to trisomy:
  • A chromosomal abnormality consisting of the presence of one chromosome in addition to the normal diploid number.
    NCI Thesaurus
    U.S. National Cancer Institute, 2021
  • Presence of an extra chromosome of one type in an otherwise diploid cell.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • The possession of a third chromosome of any one type in an otherwise diploid cell.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2021
  • The presence of an extra chromosome, resulting in a total of three copies of that chromosome instead of the normal 2 copies (e.g., trisomy 21, or Down syndrome).
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
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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.