Definition of prototoxin in English:

prototoxin

noun

Medicine
  • An inactive (non-toxic) precursor of a toxin, especially of the epsilon toxin of the pathogenic bacterium Clostridium perfringens.

Origin

Early 20th century (in an earlier sense). From proto- + toxin.

Pronunciation

prototoxin

/ˈprəʊtə(ʊ)ˌtɒksɪn/