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homology

[huh-mol-uh-jee, hoh-] /həˈmɒl ə dʒi, hoʊ-/
noun, plural homologies.
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 CH 2 .
4.
Mathematics. a classification of figures according to certain topological properties.
Origin of homology
1650-1660
1650-60; < Greek homología agreement, equivalent to homólog(os) homologous + -ia -y3
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for homologies

homology

/həʊˈmɒlədʒɪ/
noun (pl) -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
Word Origin
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
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homologies in Science
homology
  (hə-mŏl'ə-jē)   
  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.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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16
18
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