Definition: guru

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Source: WordNet (r) 1.7 

guru
     n 1: a Hindu or Sikh religious leader and personal teacher
     2: a recognized leader in some field or of some movement; "a
        guru of genomics"

Source: Webster's Revised Unabridged Dictionary (1913) 

Gooroo \Goo*roo"\, Guru \Gu*ru"\, n. [Hind. gur? a spiritual
   parent or teacher, Skr. guru heavy, noble, venerable,
   teacher. Cf. Grief.]
   A spiritual teacher, guide, or confessor amoung the Hindoos.
   --Malcom.

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

guru

   <job> An expert, especially in "Unix guru".  Implies not
   only wizard skill but also a history of being a knowledge
   resource for others.  Less often, used (with a qualifier) for
   other experts on other systems, as in "VMS guru".

   See source of all good bits.

   [Jargon File]

   (1996-06-01)

Source: Jargon File (4.3.1, 29 Jun 2001) 

guru n. [Unix] An expert. Implies not only wizard skill but also a
   history of being a knowledge resource for others. Less often, used (with
   a qualifier) for other experts on other systems, as in `VMS guru'. See
   source of all good bits.