crenation

In biological contexts, this term describes a specific pathological or physiological state of cellular dehydration. It is a technical term used primarily in histology and cytology to describe the shriveled appearance of a cell, most commonly red blood cells, when exposed to a hypertonic environment. This distinguishes it from plasmolysis, which occurs in plant cells with cell walls.

In architectural or heraldic contexts, the term refers to a physical shape characterized by alternating gaps and solid sections. It evokes the image of castle battlements (merlons and crenels), implying a notched or scalloped aesthetic. While the biological sense describes a process of shrinkage, the architectural sense describes a static geometric pattern.