Where does “tántram” come from?

tántram (Proto-Indo-Aryan) comes from Proto-Indo-Iranian tántram, from Proto-Indo-European *tántram, from Proto-Indo-European ten- — to stretch, to extend.

Ancestry of “tántram”, step by step

StepLanguageWordMeaning
1Proto-Indo-Iraniantántram—
2Proto-Indo-European*tántram—
3Proto-Indo-Europeanten-to stretch, to extend
Every word from Proto-Indo-European ten- →Every word from Proto-Indo-European *tántram →Every word from Proto-Indo-Iranian tántram →