The method in which the cells are frozen dehydrated is called?

Question: The method in which the cells are frozen dehydrated is called?

The method in which cells are frozen and then dehydrated is called lyophilization or freeze-drying. This process involves freezing the cells and then reducing the surrounding pressure to allow frozen water (ice) to sublimate directly into vapor, bypassing the liquid phase. 

Lyophilization is widely used in preserving biological materials, such as vaccines, microorganisms, and cell cultures, as it maintains their structure and viability for long-term storage.