hay bacillus is a noun meaning "a species of bacillus found in soil and decomposing organic matter; some strains produce antibiotics". It carries one recorded sense.
a species of bacillus found in soil and decomposing organic matter; some strains produce antibiotics
Definitions, synonyms and semantic relations for hay bacillus come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.