Philosopher

Part of speech: noun (n.)

1. One who philosophizes; one versed in, or devoted to, philosophy. Then certain philosophers of the Epicureans, and of the Stoics, encountered him. Acts xvii. 18.

2. One who reduces the principles of philosophy to practice in the conduct of life; one who lives according to the rules of practical wisdom; one who meets or regards all vicissitudes with calmness.

3. An alchemist. [Obs.] Chaucer. Philosopher's stone, an imaginary stone which the alchemists formerly sought as instrument of converting the baser metals into gold.