lateral meristem

This term is a technical botanical designation used primarily in academic, scientific, and horticultural contexts. It describes the specific growth tissues, such as the vascular cambium and cork cambium, that enable a plant to grow wider rather than just taller. It is distinct from apical meristems, which facilitate primary growth at the tips of roots and shoots.

Because this is a specialized biological term, it is almost exclusively used in formal descriptions of plant anatomy and physiology. It is rarely encountered in casual conversation, appearing instead in textbooks, research papers, and botanical guides to explain the mechanism of secondary thickening in woody perennials.