A device or substance that prevents or opposes diffusion, the spreading of particles through a medium.
From anti- (against) + diffuser. Diffuser comes from Latin diffundere 'to spread out.' This technical term appears in physics and chemistry contexts from the 20th century onward.
Antidiffuser membranes are crucial in dialysis machines that clean blood for kidney patients—they create barriers that let some molecules pass while blocking others, saving millions of lives!
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