philosophers' egg

noun

1

a

: the first matter of the philosophers' stone composed of salt, sulfur, and mercury

b

: gripe's egg

2

: a medicine made of saffron and the yolk of an egg and once considered a cure for plague and poison

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!