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  • IPA(key): /həˈmɒləɡəs/
  • (file)


From Latinized form of Greek homologos "agreeing, of one mind" from homos "same" + logos "relation, reasoning"

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, “[Thales.] Chapter VII. Of His Geometry.”, in The History of Philosophy. [], volume I, London: [] Humphrey Moseley, and Thomas Dring, [], OCLC 1154823569, 1st part ([Containing Those on whom the Attribute of Wise was Conferr’d]), 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.
      Flippers and hands are homologous structures.
      • 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.
    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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