filtrate
From Longman Dictionary of Contemporary Englishfiltratefil‧trate /ˈfɪltreɪt/ noun [countable, uncountable] technical a liquid from which a substance has been removed using a filterExamples from the Corpusfiltrate• The interference caused by the latter may be eliminated by preparing a protein-free filtrate. 264.• A protein free filtrate is not necessary.• A Somogyi-Nelson filtrate can not be used, since some creatinine is also precipitated along with the proteins.