skleník (Czech) comes from Czech sklený, from Czech sklo, from Old Czech stklo, from Proto-Slavic stьklo, from Gothic 𐍃𐍄𐌹𐌺𐌻𐍃, from Proto-Germanic stiklaz, from Proto-Germanic stikiz, from Proto-Indo-European (s)teyg- — to be sharp; to sting.
skleník (Czech): greenhouse