ˌbasə.ˈtrās ə n noun
( -s )
Etymology: New Latin Bacillus (genus name of Bacillus subtilis, the species producing the toxin) + Margaret Tracy b ab 1936 American child in whose tissue it was found + English -in
: a water-soluble toxic polypeptide antibiotic or mixture of antibiotics isolated as a whitish powder from one strain of the hay bacillus, effective especially against streptococci, staphylococci, pneumococci, and other gram-positive organisms, and administered chielfy topically