ラジオ
ラジオ · rajio · JLPT N5 · noun
radio
📻 ra-ji-o = English radio; di becomes ji in Japanese
A loanword from English radio, written in katakana. Older Japanese had no di sound, so it shifted to ji: ra-di-o became ra-ji-o. Say radio with a j in the middle and you have the word.