Definition of powder flask in US English:

powder flask

noun

historical
  • A small container with a nozzle for carrying and dispensing gunpowder.

    • ‘On another occasion it was stated that a man who had been brought up from the Port with his hand shattered by the explosion of a powder flask was not visited by the surgeon till the fourth day after he had been in the infirmary.’
    • ‘He buried his powder flask to the west of the pass.’

Pronunciation

powder flask

/ˈpoudər ˌflask/