philosopher -
n. 1 a person engaged or
learned in philosophy or a branch of it.
2 a person who lives by philosophy.
3 a person who shows philosophic calmness in trying circumstances.
philosophers' (or philosopher's) stone the supreme object of alchemy, a substance supposed to change other metals into gold or silver. [ME f. AF philosofre var. of OF, philosophe f. L philosophus f. Gk philosophos (as PHILO-, sophos wise)]