B

Ⅰ.

B [1] (also b) ► NOUN (pl. Bs or B's) 1) the second letter of the alphabet. 2) denoting the second item in a set. 3) Music the seventh note of the diatonic scale of C major. 4) the human blood type containing the B antigen and lacking the A.

Ⅱ.

B [2] ► ABBREVIATION 1) (in chess) bishop. 2) black (used in describing grades of pencil lead).

► SYMBOL ▪ the chemical element boron.