Definition of obturation in US English:

obturation

noun

technical
  • See obturate

    • ‘On some projectiles, there is a nylon obturating band below the rotating band to help in forward obturation.’
    • ‘By placing that plastic ball in the hollow base of the Foster slug, concentric obturation of the slug in the bore is achieved.’
    • ‘The second component of this revolution was the reintroduction of breech-loading, made possible by improved technology and especially obturation.’

Pronunciation

obturation

/ˌäbt(y)əˈrāSH(ə)n//ˌɑbt(j)əˈreɪʃ(ə)n/