In phytogeography, in or relating to œcological zones or belts. See zonc, 8.Having the character of a zone or belt.Of or pertaining to the rings, somites, or body-segments of an articulate or annulose animal; arthromeric; metameric: as, zonal symmetry, the serial homology or metameric symmetry of a segmented animal, as an arthropod or an annelid. See symmetry, 5 .In crystallography, arranged in zones: as, the zonal structure of a mineral.In botany, noting that view of a diatom in which the zone or suture of the valves is presented to the eye—the “front view” of some writers.In horticulture, marked on the leaves with a zone or circle, as many pelargoniums, also called horscshoe geraniums.