A type of blister beetle, particularly the Spanish fly, used historically in traditional medicine (though dangerously toxic).
From Greek 'kantha' (mule) and Latin/Greek root 'tharion' (insect), or from 'Cantharis,' the classical name for these beetles.
Spanish fly was actually a beetle, not a fly—and doctors used it as 'medicine' for centuries despite it being deadly poison, showing how ancient medicine sometimes trusted names more than evidence!
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