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Related to primary meristem: secondary meristem
primary meristemthe MERISTEM of the plant embryo formed of an outer protoderm (giving rise to epidermis) inside which is the ground meristem (giving rise to vacuolated ground tissue) which itself surrounds the procambium at the centre (which gives rise to the vascular bundles).
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005