• synonyms


[huh-mol-uh-jee, hoh-]
See more synonyms for homology on Thesaurus.com
noun, plural ho·mol·o·gies.
  1. the state of being homologous; homologous relation or correspondence.
  2. Biology.
    1. a fundamental similarity based on common descent.
    2. a structural similarity of two segments of one animal based on a common developmental origin.
  3. Chemistry. the similarity of organic compounds of a series in which each member differs from its adjacent compounds by a fixed increment, as by CH2.
  4. Mathematics. a classification of figures according to certain topological properties.
Show More

Origin of homology

1650–60; < Greek homología agreement, equivalent to homólog(os) homologous + -ia -y3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for homology

parity, impartiality, identity, fairness, tolerance, coordination, comparison, metaphor, parallel, correlation, correspondence, par, likeness, evenness, uniformity, equivalence, parallelism, equilibrium, equipoise, sameness

Examples from the Web for homology

Historical Examples of homology

  • Homology is still determined by position, by connections, in the embryo as in the adult.

    Form and Function

    E. S. (Edward Stuart) Russell

British Dictionary definitions for homology


noun plural -gies
  1. the condition of being homologous
  2. chem the similarities in chemical behaviour shown by members of a homologous series
  3. zoology the measurable likenesses between animals, as used in grouping them according to the theory of cladistics
Show More

Word Origin for homology

C17: from Greek homologia agreement, from homologos agreeing; see homologate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

homology in Science


  1. A homologous relationship or correspondence.
  2. The relation of the chemical elements of a periodic family or group.
  3. The relation of the organic compounds forming a homologous series.
  4. A topological classification of configurations into distinct types that imposes an algebraic structure or hierarchy on families of geometric figures.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.