Etymology

pharmacosiderite

Today it means: A hydrated basic ferric arsenate, consisting of the elements arsenic, iron, hydrogen, potassium, sodium and oxygen. Full definition →

Ancient Greek φάρμᾰκον
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The story

  1. Ancient Greek · derived fromφάρμᾰκον“poison (i.e. arsenic)”
  2. English todaypharmacosiderite

From Ancient Greek φάρμᾰκον (phármăkon, “poison (i.e. arsenic)”) + σῐ́δηρος (sĭ́dēros, “iron”) + -ite.

Etymology from Wiktionary, CC BY-SA 4.0.