Where does “отделимый” come from?
отделимый (Russian) comes from Russian отдели́ть, from Russian дели́ть, from Proto-Slavic děliti, from Proto-Balto-Slavic doyl-, from Proto-Indo-European dʰayl- — part, watershed.
Ancestry of “отделимый”, step by step
Words derived from “отделимый”