a. 带的, 带状的, 形成地带的, 分区的

[医] 带的, 区的

Zonal \Zon"al\, a. [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}.