noun
50 yen coin
Refers specifically to the Japanese 50-yen coin, which has a central hole.
自動販売機で５０円玉を使った。
I used a 50 yen coin at the vending machine.
財布の中に五十円玉がたくさんある。
There are many 50 yen coins in my wallet.
Compound of 五十 (fifty), 円 (yen), and 玉 (coin, ball).