Definition of Zonal
Zon´al
a.
1.
Of
or
pertaining
to
a
zone
;
having
the
form
of
a
zone
or
zones
.
Zonal equation
(Crystallog.)
the
mathematical
relation
which
belongs
to
all
the
planes
of
a
zone
,
and
expresses
their
common
position
with
reference
to
the
axes
.
Zonal structure
(Crystallog.)
a
structure
characterized
by
the
arrangements
of
color
,
inclusions
,
etc
.,
of
a
crystal
in
parallel
or
concentric
layers
,
which
usually
follow
the
outline
of
the
crystal
,
and
mark
the
changes
that
have
taken
place
during
its
growth
.
Zonal symmetry
(Biol.)
See
the
Note
under
Symmetry
.
Related Words
zona
,
zonary
,
zone
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