noun
keirin track; velodrome; cycle-racing track
Specifically a track for keirin (競輪) bicycle racing, a professional sport in Japan. Can also refer to a general velodrome.
彼は競輪場でレースを見た。
He watched a race at the keirin track.
A more general term for a cycling stadium or velodrome, not limited to keirin.
Compound of 競輪 (keirin, 'keirin bicycle racing') + 場 (jō, 'place, venue').