No definitions found for 'nirvana principle'
Perhaps one of these:
narrowband,
nirvanic,
narrow pennant,
nervimotor,
nirvana,
nervomuscular,
noropianic,
nerve impulse,
nerving,
nerve ending,
nerve entrapment,
narvon,
nauropometer,
nervimotion,
norepinephrine,
nerve end,
nervine