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) ]