Where does “infraczerwony” come from?
infraczerwony (Polish) comes from Polish Czerwony, from Old Polish czerwony, from Proto-Slavic čьrvenъ, from Proto-Slavic čьrvь, from Proto-Balto-Slavic kírmis, from Proto-Indo-European kʷŕ̥mis — worm.
infraczerwony (Polish): infrared
Ancestry of “infraczerwony”, step by step