prototoxin
/ˈprəʊtə(ʊ)ˌtɒksɪn/Medicine
noun
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.
- what are you on?
- what brings you here?
- what can (or do) you expect?
- whatcha
- whatchamacallit
- what cheer?
- what does —— know?
- what do (or would) you say
- what do you know (about that)?
- what do you think this is—bush week?
- what-d'you-call-it (or what's-its-name)
- whate'er
- whatev
- whatever
- whatever next
- whatevs
- what for?
- what fun!
- what gives?
- what goes around comes around
- what if ——?
- what is he (or she etc.) like?
- what is more
- what makes someone tick
- what matter?