ultrafiltrate

1 of 2

noun

ul·​tra·​fil·​trate -ˈfil-ˌtrāt 

: material that has passed through an ultrafilter in the process of ultrafiltration

ultrafiltration

2 of 2

noun

ul·​tra·​fil·​tra·​tion ˌəl-trə-fil-ˈtrā-shən 

: filtration through a medium (as a semipermeable capillary wall) which allows small molecules (as of water) to pass but holds back larger ones (as of protein)