Definify.com
Webster 1913 Edition
Zonal
Zon′al
,Adj.
[L.
zonalis
.] 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
.