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solemn
1. niobium
noun.
(ˌnaɪˈoʊbiːəm)
A
soft
grey
ductile
metallic
element
used
in
alloys;
occurs
in
niobite;
formerly
called
columbium.
Synonyms
metal
atomic number 41
columbium
niobite
columbite
Nb
metallic element
Antonyms
nonmetallic
Etymology
niobium (English)
Niobe (English)
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solemn
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