from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Derived from a different species: a heterologous graft.
  • adj. Of or relating to cytologic or histological elements not normally occurring in a designated part of the body.
  • adj. Immunologically related but not identical. Used of certain cells and antiserums.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having different relationships or different elements
  • adj. Of, or relating to different species
  • adj. heterologous blood donation

from the GNU version of the Collaborative International Dictionary of English

  • adj. Characterized by heterology; consisting of different elements, or of like elements in different proportions; different; -- opposed to homologous.

from The Century Dictionary and Cyclopedia

  • Containing or consisting of different elements or combinations; not homologous.
  • Specifically In medicine, consisting of a tissue not normally found in that place at that period of life: as, a heterologous tumor.
  • In researches in immunity, originating, as cells or serum, from an animal of a species different from the one undergoing immunization: thus, in immunizing a rabbit with the red blood-corpuscles of a goat, the latter are of heterologous origin.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. not corresponding in structure or evolutionary origin
  • adj. derived from organisms of a different but related species


from The American Heritage® Dictionary of the English Language, 4th Edition

hetero- + Greek logos, word, relation; see -logy + -ous.


  • In a narrower sense of the word heterologous new formations are alone destructive.

    The World's Greatest Books — Volume 15 — Science

  • On the other hand, every kind of heterologous formation whenever it has not its seat in entirely superficial parts, has a certain degree of malignity, and even superficial affections, though entirely confined to the most external layers of epidermis, may gradually exercise a very detrimental effect.

    The World's Greatest Books — Volume 15 — Science

  • Black SB, Cherry JD, Shinefield HR, et al. Apparent decreased risk of invasive bacterial disease after heterologous childhood immunization.

    Vaccine Safety FAQs

  • Genetic engineering: the capacity to manipulate genes in organisms to create new genes, or introduce genes into heterologous organisms e.g., a human gene in a bacterial cell.

    The Emperor of All Maladies

  • Bacterial interference; protection of adults against nasal Staphylococcus aureus infection after colonization with a heterologous S. aureus strain.


  • It seems to me that the focus needs to be on the cessation of homologous and heterologous embryo production, and then decide what to do with the remaining frozen embryos knowing that the practice of creating life artificially outside of marriage and the conjugal act is no longer an issue.

    The difficult issue of embryonic adoption

  • The proposal that these embryos could be put at the disposal of infertile couples as a treatment for infertility is not ethically acceptable for the same reasons which make artificial heterologous procreation illicit as well as any form of surrogate motherhood; this practice would also lead to other problems of a medical, psychological and legal nature.

    The difficult issue of embryonic adoption

  • Nonetheless, the panel expressed concern about the “extensive mixing” that would occur in some chimera research and unanimously opposed, “on ethical and scientific grounds, the creation of heterologous, or human-nonhuman chimeras, with or without transfer [into a uterus]” (NIH 1994, 80).

    Human/Non-Human Chimeras

  • And what everyone says about the comparisons between Katrina and the fires -- and a lot of this really is heterologous.

    CNN Transcript Oct 25, 2007

  • The micrococcal nuclease calcium dependence was put to good use by Hugh Pelham, a graduate student in the lab, who developed the use of nuclease treatment of the lysate to assay heterologous mRNAs.

    Tim Hunt - Autobiography


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