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From: WordNet (r) 2.0

 Np
      n 1: a radioactive transuranic metallic element; found in trace
           amounts in uranium ores; a by-product of the production
           of plutonium [syn: neptunium, atomic number 93]
      2: a registered nurse who has received special training and can
         perform many of the duties of a physician [syn: nurse
         practitioner, nurse clinician]