Resembling or relating to a toxin-like substance, especially one that forms on the outer surface of something.
Combining 'epi-' (upon) with 'toxoid,' which itself comes from Greek 'toxikon' (poison) plus '-oid' (resembling). The term emerged in medical and toxicological literature to describe surface-level toxic properties.
Toxoids are actually one of medicine's clever tricks—they're poisons that have been weakened just enough to teach your immune system what to fight without actually harming you, and they're used in vaccines like tetanus shots.
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