• IPA(key): /həˈmɒləɡəs/
  • (file)


From 1655, in the mathematical sense.[1] See also homolog, homologue. (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)


homologous (comparative more homologous, superlative most homologous)

  1. Showing a degree of correspondence or similarity.
    1. (mathematics) In corresponding proportion.
      • 1655, Thomas Stanley, The History of Philosophy, Volume 1, page 18,
        Of equiangle triangles, the sides that are about equall angles are proportionall, and the ſides that ſubtend the equall angles are homologous.
    2. (biology) Corresponding to a similar structure in another life form with a common evolutionary origin.
      • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page 4:
        Lobules, homologous in structure, recur again only in the Gondwanalandic families Lepidolaenaceae and Jubulopsidaceae thus in the Lepidolaenineae.
      Flippers and hands are homologous structures.
    3. (chemistry) Belonging to a series of aliphatic organic compounds that differ only by the addition of a CH2 group.
    4. (genetics) Having the same morphology as another chromosome; relating to a homologue.

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