Old Church Slavonic
- Glagolitic: ⱍⱃⱏⱀⱏ (črŭnŭ)
From Proto-Slavic *čьrnъ, from Proto-Balto-Slavic *kirsnos, from Proto-Indo-European *kr̥snós (“black”). Cognates include Lithuanian kir̃snas (“black”), Norwegian and Swedish harr (“grayling”), Old Prussian kirsnan (“black”) and Sanskrit कृष्ण (kṛṣṇá, “black”).
чрънъ • (črŭnŭ)
- “черный” in Max Vasmer (1986), Etimologičeskij slovarʹ russkogo jazyka [Etymological Dictionary of the Russian Language], in 4 vols (second edition), Moscow: Progress — Translated from German and supplemented by O. N. Trubačóv