[ni.o.bi.um] n [NL, fr. L Niobe; fr. its occurrence in tantalite] (1845): a lustrous light gray ductile metallic element that resembles tantalum chemically and is used in alloys
NIOBIUM
Meaning of NIOBIUM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012