extraction - the process of obtaining something from a mixture or compound by chemical or physical or mechanical means

freeze-drying, lyophilisation, lyophilization - a method of drying food or blood plasma or pharmaceuticals or tissue without destroying their physical structure; material is frozen and then warmed in a vacuum so that the ice sublimes

inspissation - the process of thickening by dehydration

plastination - a process involving fixation and dehydration and forced impregnation and hardening of biological tissues; water and lipids are replaced by curable polymers (silicone or epoxy or polyester) that are subsequently hardened; "the plastination of specimens is valuable for research and teaching"