People or things that completely remove or destroy something, especially disease, pests, or evil.
From Latin 'eradicare' (to root out) + '-or' (agent suffix) + '-s' (plural). The Latin root combines 'ex-' (out) and 'radix' (root), literally meaning to pull out by the roots. The meaning evolved to apply to any complete removal or destruction.
The word 'eradicator' literally means 'root-puller'—the Romans used this exact metaphor about yanking weeds out of gardens, and we still use it today when we talk about eradicating diseases or poverty, as if we're pulling out the deepest roots of a problem.
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