gadolinium: a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group
metallic element: any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
masorah: a vast body of textual criticism of the Hebrew Scriptures including notes on features of writing and on the occurrence of certain words and on variant sources and instructions for pronunciation and other comments that were written between AD 600 and 900 by Jewish scribes in the margins or at the end of texts