To remove water from something while simultaneously freezing it, a preservation method that combines drying and freezing.
From prefix de- (remove) + hydro- (water) + freeze (from Old English frēosan). This is a 20th-century scientific compound combining dehydration and freezing processes.
Dehydrofreezing is actually used in space programs and emergency food supplies because it creates incredibly lightweight, shelf-stable products—astronauts eat dehydrofrozen food that weighs a fraction of regular frozen meals!
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