(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.
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.
1》 the chemical element boron.
2》 Physics magnetic flux density.