serumnounmasculine/ˈsoɾu/mediumso·roPortuguesEnglishEspanolFrancaisDefinitionA liquid that separates from blood when it clots, used in medicine.The doctor administered an intravenous serum.Serum is used for hydration.synfluidliquidCommon collocationsantivenom serumphysiological serumEtymologyDo latim 'sorus'Related wordssoroterapiasorológico