bacteriophagePronunciation: /bakˈtɪərɪə(ʊ)feɪdʒ, -fɑːʒ/Definition of bacteriophage noun Biology a virus which parasitizes a bacterium by infecting it and reproducing inside it. Bacteriophages are much used in genetic research. Origin: 1920s: from bacterium + Greek phagein 'eat'bacteriophage in other Oxford dictionaries Definition of bacteriophage in the US English dictionary
