niobium niobite • niobous · · · Info · Definitions · Synonyms · Characters · · niobium · · Text Latin · · Script 7 · · Length Definitions · · · (noun) a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium. Synonyms: Nb, atomic number 41. · · Noun Definition 1 Synonyms · · · nb · · Synonym 1 atomic number 41 · · Synonym 2 Characters · · b latin small letter b U+0062 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F u latin small letter u U+0075