ultrafiltration

Definition

A filtration process using membranes with tiny pores to separate small molecules from large ones—essentially a molecular bouncer that only lets the small stuff through. Used in everything from kidney dialysis to water purification, it's like a very selective coffee filter for liquids. The 'ultra' part just means the pores are really, really small.

Example Usage

The dialysis machine used ultrafiltration to remove waste products from his blood, acting as an artificial kidney with better plumbing.

Source: Medical and engineering terminology

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