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ultra-
ultra-heat-treated
ultra vires
ultrabasic
ultracentrifuge
ultrafiche
ultrafilter
ultrafiltrate
ultrafiltration
ultrahigh frequency
ultraism
ultralarge crude carrier
ultralight
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ultrafiltration

ul·tra·fil·tra·tion [ ùltrəfil tráysh'n ]


noun 
Definition:
 
filtering of very small particles: a filtration process that uses a porous membrane to isolate and remove particles such as bacteria and viruses. The process is used for water purification and in the pharmaceutical industry.

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