Guru  ( Sanskrit. Достой - worthy , great , important , heavy , established in truth , unshakable , teacher , master  ) in Hinduism and Buddhism - a spiritual mentor, teacher. In Punjabi Sikhism - the title of the head of a religious community.
Guru, in the strict sense, is a spiritual teacher, transmitting knowledge (first of all, the truth about God, Brahman ), those who direct and nourish the awakening of the disciple.
In a number of Puranas , it is stated that the guru in Kali-yuga is not an impeccable authority  .
In the Hindu tantrism , according to the French Indologist Andre Padu According to tradition, the guru should usually be a Brahmin varna , should come from a good family; as a rule, a tantric guru must be a married man, know the sastras and be able to teach them, etc. 
Guru is also one of the names of Brhaspati in Hinduism.
- GRAMOTA.RU - Word Verification
- Sanskrit-English online dictionary SpokenSanskrit.de .
- Bhagavata Purana 12.2.4-5, 12.3.32, 12.3.38; Narada Purana 1.41.24-88; Padma Purana 6.71.56-60; Kurma Purana 1.30.31; Linga-Purana 40.5; Vayu Purana 58.52-66
- Padoux A. The Tantric Guru // Tantra in practice, ed. by DG White . - Princeton and Oxford: Princeton University Press , 2000. - p. 44
- Gorakshanath . Pataya Upadesha // Siddha-Siddhanta Paddhati .
- Guru / Lysenko V. G. // Grigoriev - Dynamics. - M .: The Great Russian Encyclopedia, 2007. - (The Great Russian Encyclopedia : [in 35 tons.] / Ch. Ed. Yu. S. Osipov ; 2004–2017, vol. 8). - ISBN 978-5-85270-338-5 .