Initialism of part number. / (medicine) Abbreviation of practical nurse. / (Malaysia, politics, uncountable) Initialism of Perikatan Nasional (“National Alliance”).

Initialism of peripheral nervous system. / Initialism of peripheral nervous stimulation, the potential side effect of fast magnetic field changes during MRI procedures.

Initialism of National Council Licensure Examination for Practical Nurses.

(medicine) A disease of the lungs caused by inhalation of particulate matter.

Of, relating to, or resembling air or other gases / Of or relating to pneumatics / Powered by, or filled with, compressed air / (zoology) Having cavities filled with air

(dated) A vehicle, such as a bicycle, whose wheels are fitted with pneumatic tyres.

(medicine) Pneumonia affecting one lung.

Pneumonia affecting both lungs.

An acute or chronic inflammation of the lungs caused by viruses, bacteria or other microorganisms, or sometimes by physical or chemical irritants.

Initialism of personal navigation assistant. / (biochemistry) Initialism of peptide nucleic acid. / (pathology) Initialism of pulmonary nodular amyloidosis.