Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
bacteriophage is a noun meaning "a virus that is parasitic (reproduces itself) in bacteria". It carries one recorded sense.
a virus that is parasitic (reproduces itself) in bacteria
“phage uses the bacterium's machinery and energy to produce more phage until the bacterium is destroyed and phage is released to invade surrounding bacteria”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for bacteriophage come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.