[f. ZONE sb. + -ATION.] a. Distribution in zones or regions of definite character (see ZONE sb. 7). b. Formation of zones or concentric layers, as in a growing plant-cell.
1902. Bot. Gaz., Dec., 421. During the completion of the mitosis the ooplasm and periplasm become clearly differentiated, but as yet no plasmoderma exists. This process of differentiation has been termed zonation.
