deletery
Destructive, poisonous
obsolete
Nor engine, nor device polemic, / Disease, nor doctor epidemic, / Tho' stored with deletery med'cines, / Which whosoever took is dead since, / E'er sent so vast a colony / To both the under worlds as he.
Where it comes from
From New Latin dēlētērius, from Ancient Greek δηλητήρῐος (dēlētḗrĭos). Doublet of deleterious.
Adapted from the Wiktionary entry deletery (CC BY-SA 4.0).