auxotox

aux·o·tox

(awk'sō-toks),
An atomic grouping that, when present in a molecule, intensifies its poisonous characteristics.
[G. auxanō, to increase, + toxikon, poison]

auxotox

Etymology: Gk, auxein, increase, toxikon, poison
a chemical with a particular atomic grouping that, if added to a relatively benign substance, increases the toxic characteristics of the mixture.