phi·los·o·pher /fəˈlɑs(ə)fɚ/
  哲學家,哲人,思想家
  Phi·los·o·pher 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.]
  Philosopher's stone, an imaginary stone which the alchemists formerly sought as the instrument of converting the baser metals into gold.
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  philosopher
       n 1: a specialist in philosophy
       2: a wise person who is calm and rational; someone who lives a
          life of reason with equanimity