A weapon was an object designed or used for inflicting bodily harm or physical damage.
The Moment was the most powerful and most dangerous weapon in all of creation. It was held in the Omega Arsenal on Gallifrey, a collection of deadly and ancient Time Lord weapons that were forbidden to be used. During the course of the Last Great Time War, all of these weapons were removed from the Arsenal and deployed against the Dalek threat. (TV: The Day of the Doctor) Their usage of the Arsenal led to the creation of the Dalek Eternity Circle who constructed the Temporal Cannon as a counter. (PROSE: Engines of War) During the closing days of the war, the Daleks made an effort to claim the weapon factories at Villengard only for the War Doctor to detonate a molecular fruit bomb that turned the area into a banana grove. (COMIC: The Whole Thing's Bananas) This adversarial relationship with the Time Lords caused the Daleks to view TARDISes as weapons. (TV: Journey's End)
The Deathsmiths of Goth were venerated, even by the Daleks, for their ability to create weapons. (COMIC: Black Legacy) When the New Dalek Paradigm was created, they claimed Goth's weapon production capabilities to quickly construct a galaxy conquering army. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe)
The Doctor, largely a believer in non-violence, normally eschewed the usage of conventional weapons and voiced a dislike of them. (TV: The Sensorites) This was such a hallmark of their character that a Dalek Supreme openly mocked the Twelfth Doctor when he brandished a Dalek gunstick at it, confident that it was in no danger of being fired on. (TV: The Witch's Familiar) Rassilon would later make the claim that words were the Doctor's true weapon (TV: Hell Bent) while Davros, after seeing the lengths the Children of Time went to to stop the New Dalek Empire, believed that the Doctor made weapons out of their companions. (TV: Journey's End) The Tenth Doctor once claimed that books were the "best weapons in the world". (TV: Tooth and Claw)
Madame Kovarian's intent behind the genetic manipulation of the Melody Pond was to create a weapon that could provide hope in the Siege of Trenzalore. (TV: A Good Man Goes to War, The Time of the Doctor)