Nicotinic - Relating to, resembling, producing, or mediating the effects produced by nicotine on nerve fibers at autonomic ganglia and at the neuromuscular junctions of voluntary muscle which increase activity in small doses and inhibits it in larger doses.

nm - Nanometer (1 billionth of a meter).

Non -ionizing Radiation - Radiation that has insufficient energy to remove electrons from atoms. Laser and Radiofrequency radiation is considered non-ionizing radiation.

Non-persistant - Non-persistent chemical agents disperse rapidly after release and present an immediate, short duration hazard.

NRC - Nuclear Regulatory Commission.

Nuclei - See nucleus.

Nucleus - The center of an atom consisting of protons and neutrons.

Obtundation - Dulling.

Oliguria - Secretion of a diminished amount of urine in relation to the fluid intake.

Orthopnea - Difficult breathing except in an upright position.

Osteomyelitis - Inflammation of bone caused by a pyogenic organism.

Pallor - Paleness; absence of skin color.

Pannus - Superficial vascularization of the cornea with infiltration of granulation tissue.

Papule - A small circumscribed, superficial, solid elevation of the skin.

Parenchyma - The essential elements of an organ; used in anatomical nomenclature as a general term to designate the functional elements of an organ, as distinguished from its framework.

Pathogenicity - The capability of an infectious agent to cause disease in a susceptible host.

PB - Pyridostigmine Bromide.