Where does “guru” come from?

guru (Swahili) comes from Hindi गुड़, from Old Hindi गुड, from Sauraseni Prakrit 𑀕𑀼𑀟, from Sanskrit गुड, from Proto-Dravidian *kuṭV — eyeball.

Ancestry of “guru”, step by step

StepLanguageWordMeaning
1Hindiगुड़jaggery
2Old Hindiगुड—
3Sauraseni Prakrit𑀕𑀼𑀟—
4Sanskritगुडsugar which forms itself into lumps, dry sugar,...
5Proto-Dravidian*kuṭVeyeball
Every word from Proto-Dravidian *kuṭV →Every word from Sanskrit गुड →Every word from Sauraseni Prakrit 𑀕𑀼𑀟 →