n.
Pronunciation: ' gu ̇ r-( ˌ )ü, ' gü-( ˌ )rü also g ə - ' rü
Function: noun
Inflected Form: plural gurus
Etymology: ultimately from Sanskrit guru, from guru, adjective, heavy, venerable ― more at GRIEVE
Date: 1613
1 : a personal religious teacher and spiritual guide in Hinduism
2 a : a teacher and especially intellectual guide in matters of fundamental concern b : one who is an acknowledged leader or chief proponent c : a person with knowledge or expertise : EXPERT