The ALAD for last Tuesday was "colosseum".

What sport in the old colosseum
To see blood on the field every diem!
The gladiators of today
Hardly sweat for their pay
Yet their fans are dyin' to see 'em.

coliseum (KOL-i-SEE-uhm) noun, also colosseum

A large stadium, theater, or similar building for sports, cinema, exhibitions, etc.

After Colosseum, name of the amphitheater in Rome, from Latin colosseus (gigantic). [per Anu]