positioning
positive
positive-alpha
positive-displacement
positive-going
positive-ion
positively
positive-pressure
positive-ray
positron
  positron-electron
positron-emitting
possible
post
post-acceleration
postaccelerator
postal
post-and-stall
post-box
post-cutoff
post-detection

    positron-electron annihilation

    аннигиляция позитронно-электронной пары