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Definition of neptunium : A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite.

Synonyms:

nurse practitioner, nurse clinician, Np, atomic number 93

europium, iodine, cobalt, zinc, neodymium, arsenic, carbon, argon, beryllium, silver, polonium, boron, promethium, platinum, antimony, radium, americium, chlorine, sulfur, manganese, tellurium, cadmium, erbium, copper, technetium, praseodymium, lutetium, cesium, fermium, germanium, nickel, oxygen, lead, thallium, palladium, mendelevium, californium, rhodium, xenon, berkelium, curium, thulium, ruthenium, lithium, gallium, nitrogen, magnesium, mercury, iron, uranium, phosphorus, tin, bromine, terbium, cerium, krypton, niobium, holmium, scandium, potassium, rubidium, thorium, helium, osmium, strontium, hydrogen, indium, neon, gold, hafnium, vanadium, sodium, bismuth, molybdenum, rhenium, ytterbium, einsteinium, gadolinium, calcium, nobelium, plutonium, titanium, dysprosium, lanthanum, francium, iridium, chromium, selenium, aluminum, yttrium, tungsten, silicon, astatine, actinium, tantalum, fluorine, barium, radon, zirconium, samarium, element, protactinium

Usage examples:

• The California scientists called the newly discovered element neptunium, because it lies beyond the element uranium just as the planet Neptune lies beyond Uranus. - "A Brief History of Element Discovery, Synthesis, and Analysis", Glen W. Watson.