The study of bacteriophages.
protobiology(1) A rarely used term for the formal study of minute life forms—e.g., ultraviruses, bacteriophages.
(2) Bacteriophagology; not in common use.
protobiology(prō″tō-bī-ŏl′ō-jē) [Gr. protos, first, + bios, life, + logos, word, reason]
The study of microorganisms smaller than bacteria, i.e., the viruses.