colosseum Meaning, Definition & Usage

  1. noun a large amphitheater in Rome whose construction was begun by Vespasian about AD 75 or 80
    Amphitheatrum Flavium.

WordNet

Col`os*se"um noun
Etymology
Neut., fr. L. coloseus gigantic. See Coliseum.
Definitions
  1. The amphitheater of Vespasian in Rome. Also written Coliseum.

Webster 1913