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Homology
ENGLISH MEANING
noun
1.
The
quality
of
being
homologous
;
correspondence
;
relation
; as, the
homologyof
similar
polygons
.
2.
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
.
3.
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
.