Formal, legal term for a slot machine, especially in the context of pachinko parlors and gambling regulations. In everyday speech, パチスロ is far more common.
See also: パチスロ
Slot machines are defined in the Act on Control and Improvement of Amusement Businesses, etc.
This parlor is equipped with the latest slot machines.
Compound of 回胴 (rotating drum), 式 (type), 遊技 (amusement/game), and 機 (machine). A descriptive legal term coined to define slot machines under Japanese law.