arcanum

[ad_1] noun, plural ar·ca·na [ahr-key-nuh] /ɑrˈkeɪ nə/.

1. Often arcana. a secret; mystery.
2. a supposed great secret of nature that the alchemists sought to discover.
3. a secret and powerful remedy.

noun Latin.

1. secret of secrets.

noun plural -na (-nə)

1. (sometimes plural) a profound secret or mystery known only to initiates
2. a secret of nature sought by alchemists

n.

proper singular form of arcana.

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