Ordnance /(?)/

Ord·nance

Ordnance

n.
  1. Heavy weapons of warfare; cannon, or great guns, mortars, and howitzers; artillery; sometimes, a general term for all weapons, ammunitiion, and appliances used in war.
    All the battlements their ordnance fire.
    Then you may hear afar off the awful roar of his [Rufus Choate's] rifled ordnance.
    — E. Everett.

Phrases & Compounds

Ordnance survey
the official survey of Great Britain and Ireland, conducted by the ordnance department.