From Proto-Slavic *tьrnъ, from Proto-Indo-European *tr̥nom, *(s)tern- (“sharp stalk or thorn”), possibly derived from *ster- (“stiff”). Cognate with Czech and Slovene trn, Bulgarian трън (trǎn), Serbo-Croatian трн/trn, Russian тёрн (tjórn) and терние (ternije). Non-Slavic cognates include English thorn and Sanskrit तृण (tṛ́ṇa, “grass”).
- thorn (protective spine of a plant)
- tŕň in Slovak dictionaries at korpus.sk