homology

Information
Speech
homology
Definition
Noun 
A homologous relationship.
Etymology
Noun 
Biology
A correspondence of structures in two life forms with a common evolutionary origin, such as flippers and hands.
Etymology
Meaning note
biology
Noun 
Chemistry
The relationship between the elements in the same group of the periodic table, or between organic compounds in a homologous series.
Etymology
Meaning note
chemistry
Noun 
A theory associating a system of groups to each topological space.
Etymology
Meaning note
topology
Noun 
A certain system of groups associated to a chain complex.
Etymology
Meaning note
algebra
Noun 
Genetics
The presence of the same series of bases in related genes.
Usage note
Like many terms that start with a non-silent h but have emphasis on their second syllable, some people precede homology with an, others with a. (biology): For a discussion of the use of the term homology (and by association homologous) in biology, see: Patterson, Colin. "Homology in Classical and Molecular Biology." Molecular Biology and Evolution 5, no. 6 (November 1988): 603–625. http://mbe.oxfordjournals.org/cgi/reprint/5/6/603.pdf (accessed 18 December 2009; archived 18 December 2009, http://www.webcitation.org/5m7rn4rCe ) (mathematics): When used attributively before the name of a topological space, as in homology n-sphere or homology manifold, the reference is to a space whose homology is the same as that of the space mentioned: an homology manifold, for example, is a space whose homology is that of some manifold. (mathematics): In modern usage, the term is used to mean homology group. Thus, X did Y by computing the homology of Z means X did Y by computing the homology groups of Z. More loosely, as used in homology in a space, the term corresponds to a singular homology group (group of singular homologies).
Etymology
Meaning note
genetics
Noun Verb Adjective Adverb Other
Etymology
From homo- +‎ -logy.
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