A dirk is a long-bladed thrusting dagger. Historically, it gained its name from the Highland dirk where it was a personal weapon of officers engaged in naval hand-to-hand combat during the Age of Sail
Scottish dirk, blade by Andrew Boog, Edinburgh, c. 1795, Royal Ontario Museum
Painting of George Gordon, 5th Duke of Gordon (1770–1836) in highland dress.
A dagger is a fighting knife typically with a very sharp point and usually one or two sharp edges, typically designed or capable of being used as a cutting or thrusting weapon. Daggers have been used
Dirk
…A dirk is a long-bladed thrusting dagger. Historically, it gained its name from the Highland dirk (Scottish Gaelic biodag) where it was a personal weapon of officers engaged in naval hand-to-hand…
The Fairbairn–Sykes fighting knife, a modern-day dagger
A bronze dagger from Lorestan, Iran, 2600–2350 BCE
A Neolithic dagger from the Muséum de Toulouse
Pre-Roman Iberian iron dagger forged between the middle of the 5th and the 3rd century BC