cell junction

This term is a technical biological descriptor used primarily in histology and cell biology. It refers to the physical interfaces where the membranes of two adjacent cells meet, serving either as a restrictive barrier to prevent leakage or as a communicative channel for molecular exchange.

In a scientific context, the term is often specified by the type of junction, such as tight junctions, gap junctions, or desmosomes. Because it describes a physical anatomical structure, it is treated as a standard countable noun in academic writing.