npt

/EH1 N P T/
noun
  1. 1

    Initialism of nuclear nonproliferation treaty.

  2. 2

    Initialism of nocturnal penile tumescence. [(medicine) An erection during sleep or on waking up.]

  3. 3

    Initialism of national pipe thread.

  4. 4

    Initialism of national pipe tapered.