philosophers' egg

noun

Definition of philosophers' egg

1a : the first matter of the philosophers' stone composed of salt, sulfur, and mercury
2 : a medicine made of saffron and the yolk of an egg and once considered a cure for plague and poison

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“Philosophers' egg.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/philosophers%27%20egg. Accessed 7 Aug. 2020.

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