1800, gooroo, from Hindi guru "teacher, priest," from Sanskrit guru-s "one to be honored, teacher," literally "heavy, weighty," from PIE root *gru- (see grave (adj.)). Generalized sense of "mentor" is from 1940; sense of "expert in something" first recorded c.1966 in Canadian English in reference to Marshall McLuhan.
In Hinduism, a teacher or spiritual leader.
Note: By extension, a “guru” is a teacher who attracts disciples or followers.
[fr Sanskrit, ''venerable'']
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)