B 1
(also b )
■ noun ( plural Bs or B's )
1》 the second letter of the alphabet.
2》 denoting the second, second-best, or secondary item in a set.
3》 Music the seventh note of the diatonic scale of C major.
4》 the human blood type (in the ABO system) containing the B antigen and lacking the A.
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B 2
■ abbreviation
1》 Belgium (international vehicle registration).
2》 (in chess) bishop.
3》 black (used in describing grades of pencil lead).
4》 bomber (in designations of US aircraft types): a B-52.
■ symbol
1》 the chemical element boron.
2》 Physics magnetic flux density.