elongation zone

This term is a specialized botanical descriptor used primarily in plant physiology and anatomy. It describes a specific spatial region of growth, distinguishing it from the zone of cell division (meristem) and the zone of maturation. The term carries a neutral, scientific register and is almost exclusively found in academic textbooks, research papers, and biological diagrams.

Because it refers to a specific anatomical region, it is treated as a countable noun in a biological context, allowing for the discussion of multiple elongation zones across different roots or species.