Source : Webster's Revised Unabridged Dictionary (1913)

Preceptor \Pre*cep"tor\, n. [L. praeceptor, fr. praecipere to
   teach: cf. F. pr['e]cepteur. See {Precept}.]
   1. One who gives commands, or makes rules; specifically, the
      master or principal of a school; a teacher; an instructor.

   2. The head of a preceptory among the Knights Templars. --Sir
      W. Scott.

Source : WordNet®

preceptor
     n : teacher at a university of college (especially at Cambridge
         or Oxford) [syn: {don}]