出典:Wiktionary
From Hindi गुरू (gurū) / Urdu گرو (guru), from Sanskrit गुरु (gurú, “venerable, respectable”), originally "heavy" and in this sense cognate to English grieve. (A traditional etymology based on the Advaya Taraka Upanishad (line 16)[1] describes the syllables gu as 'darkness' and ru as 'destroyer', thus meaning "one who destroys/dispels darkness")
「gurus」は名詞「guru」の複数形です