The term 'GLADIATOR's weapon' can be summarized by two crossword solutions: SPEAR (5 letters) and TRIDENT (7 letters). A SPEAR is a pole weapon consisting of a shaft, usually of wood, with a pointed head. It is used for thrusting or throwing and has been used throughout human history. A TRIDENT is a three-pronged SPEAR that was used by the ancient Greeks and Romans. It was often associated with Poseidon, the god of the sea, and was used as a symbol of power and authority. Both the SPEAR and TRIDENT were commonly used by gladiators in ancient Rome.