Substances that cause death or harm if swallowed, inhaled, or absorbed through the skin, or the act of giving someone poison to harm them.
From Old French 'poison,' derived from Latin 'potio' (drink or potion), originally meaning any drink or liquid before evolving to specifically mean toxic drinks.
The phrase 'the dose makes the poison' comes from Paracelsus, a Renaissance physician who discovered that almost every substance is toxic at high enough doses—even water can kill you (water intoxication is real).
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