philosopher's stone
A legendary alchemical substance said to turn base metals into gold and grant immortality. Often used in fantasy and historical contexts.
See also: 賢者の石
Alchemists sought the philosopher's stone.
In the Harry Potter story, the philosopher's stone plays an important role.
Synonym; 賢者の石 is also used for the philosopher's stone, but 哲学者の石 is more literal.
From 哲学者 (philosopher) + の (possessive particle) + 石 (stone). A direct translation of the Western concept of the philosopher's stone.