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formerly the symbol for the element columbium, now called niobiumniobium
, metallic chemical element; symbol Nb; at. no. 41; at. wt. 92.90638; m.p. about 2,468°C;; b.p. 4,742°C;; sp. gr. 8.57 at 20°C;; valence +2, +3, +4, or +5.
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catch basin

A reservoir, esp. for catching and retaining surface drainage over a large area, in which sediment may settle.



(1) See CB radio and cell broadcast.
References in periodicals archive ?
DELIGHTED: Chris Marsh (above) and (below) Polly Dickinson of Coventry City Council talks about CBED at the roadshow.
ProteoSpin CBED Micro Kit - simultaneously concentrates, provides buffer exchange and removes salts using a rapid procedure.