B

Multiple Entries:
  B    b    boron  

Concise Oxford English Dictionary © 2008 Oxford University Press:
B1 (also b)

▶noun (pl. 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.

Concise Oxford English Dictionary © 2008 Oxford University Press:
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.

Concise Oxford English Dictionary © 2008 Oxford University Press:
b/biː/

▶abbreviation

• 1 Physics barn(s).

• 2 (b.) born.

• 3 Cricket bowled by.

• 4 Cricket bye(s).

Concise Oxford English Dictionary © 2008 Oxford University Press:
boron /ˈbɔːrɒn/

▶noun the chemical element of atomic number 5, a non-metal which can be isolated as a brown, amorphous powder or (if pure) a black crystalline semiconductor. (Symbol: B)

– origin C19: from borax, on the pattern of carbon.