Where does “*स्रोत्र” come from?

*स्रोत्र (Sanskrit) comes from Sanskrit सर, from Proto-Indo-European srew-, from Proto-Indo-European ser- — to flow; to guard; to bind, to tie together.

Ancestry of “*स्रोत्र”, step by step

StepLanguageWordMeaning
1Sanskritसरstring, cord; flowing
2Proto-Indo-Europeansrew-to flow, stream
3Proto-Indo-Europeanser-to flow; to guard; to bind, to tie together
Every word from Proto-Indo-European ser- →Every word from Proto-Indo-European srew- →Every word from Sanskrit सर →