noun
- a mysterious or secret matter; something known or understood by very few
- a supposed great secret of nature that alchemists sought to discover
Usage: formal
Usage: historical; alchemy
Examples
- The ancient text contained arcana that scholars had debated for centuries.
- She guarded the arcanum of her success jealously.
- The alchemist spent his life searching for the arcanum that would turn lead into gold.
- The professor hinted at arcana within the field that only experts could comprehend.
- Medieval texts often referred to medical arcana known only to physicians.
- The organization’s arcanum was passed down through generations of members.