neodidymium

Noun

neodymium (countable and uncountable, plural neodymiums)

1. A chemical element (symbol Nd) with an atomic number of 60: a hard, slightly malleable silvery rare earth metal that quickly tarnishes in air and moisture.
   • Other rare elements, like neodymium, exist in more than one isotopic form, the ratios of which can provide a measure of the depth from which the flow material may ultimately have been derived.2004, Richard Fortey, The Earth, Folio Society, published 2011, page 63
   1. (countable) An atom of this element.