B

B¹

(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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B²

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.