HOMOLOGIES
Noun
homologies
plural of homology
Anagrams
• homologise
Source: Wiktionary
HOMOLOGY
Ho*mol"o*gy, n. Etym: [Gr. Homologous.]
1. The quality of being homologous; correspondence; relation; as, the
homologyof similar polygons.
2. (Biol.)
Definition: Correspondence or relation in type of structure in
contradistinction to similarity of function; as, the relation in
structure between the leg and arm of a man; or that between the arm
of a man, the fore leg of a horse, the wing of a bird, and the fin of
a fish, all these organs being modifications of one type of
structure.
Note: Homology indicates genetic relationship, and according to
Haeckel special homology should be defined in terms of identity of
embryonic origin. See Homotypy, and Homogeny.
3. (Chem.)
Definition: The correspondence or resemblance of substances belonging to
the same type or series; a similarity of composition varying by a
small, regular difference, and usually attended by a regular
variation in physical properties; as, there is an homology between
methane, CH4, ethane, C2H6, propane, C3H8, etc., all members of the
paraffin series. In an extended sense, the term is applied to the
relation between chemical elements of the same group; as, chlorine,
bromine, and iodine are said to be in homology with each other. Cf.
Heterology. General homology (Biol.), the higher relation which a
series of parts, or a single part, bears to the fundamental or
general type on which the group is constituted. Owen.
– Serial homology (Biol.), representative or repetitive relation in
the segments of the same organism, -- as in the lobster, where the
parts follow each other in a straight line or series. Owen. See
Homotypy.
– Special homology (Biol.), the correspondence of a part or organ
with those of a different animal, as determined by relative position
and connection. Owen.
Source: Webster’s Unabridged Dictionary 1913 Edition