Chemical Element, Symbol Nb, Aka Columbium
Puzzle 16 of Cold Places Easy Pack
Question is: Chemical Element, Symbol Nb, Aka Columbium
and the answer is: NIOBIUM
Word Meaning:
NIOBIUM — A chemical element (symbol Nb) with an atomic number of 41: a light grey, crystalline, ductile transition metal used in superconducting materials.
Definitions from Wiktionary.