Where does “সায়ন” come from?

সায়ন (Bengali) comes from Sanskrit सायन, from Sanskrit स-, from Proto-Indo-Aryan *sa-, from Proto-Indo-Iranian sa-, from Proto-Indo-European sm̥-, from Proto-Indo-European sem- — together, one.

Ancestry of “সায়ন”, step by step

StepLanguageWordMeaning
1Sanskritसायनreckoned relative to or with the precession of the vernal equinoctial point
2Sanskritस-with
3Proto-Indo-Aryan*sa-—
4Proto-Indo-Iraniansa-together, co-
5Proto-Indo-Europeansm̥-one; with, together
6Proto-Indo-Europeansem-together, one
Every word from Proto-Indo-European sem- →Every word from Sanskrit स- →Every word from Proto-Indo-European sm̥- →