소수만이 아는 비밀이나 심오한 지식.
A deep secret or mystery; specialized knowledge or information that is known only to a few people.
예문:
"The arcana of modern physics can be daunting for those without a mathematical background."
"He spent years studying the political arcana of the royal court to understand how decisions were truly made."
연금술사들이 찾던 비약이나 신비로운 물질.
A secret medicinal preparation or a mysterious substance sought by alchemists; an elixir.
예문:
"Ancient texts describe an arcanum believed to grant eternal youth to whoever consumed it."
"The alchemist claimed to have discovered the Great Arcanum, a substance capable of transmuting lead into gold."