The active bitter compound or glycoside extracted from colocynth fruit, responsible for its strong laxative and medicinal properties.
From 'colocynth' + the chemical suffix '-in.' As chemistry developed in the 19th century, scientists isolated and named the active compounds in medicinal plants using this '-in' ending (like quinine, caffeine, morphine).
Before chemistry could identify active ingredients, doctors had to guess at dosing based on how violently someone would react—isolating colocynthin allowed precise measurement, which was a huge leap forward for safety, though people still didn't fully understand why it worked.
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