(~s)
1.
A ~ is a hard, bright, precious stone which is clear and colourless. Diamonds are used in jewellery and for cutting very hard substances.
...a pair of ~ earrings.
N-VAR
2.
A ~ is a shape with four straight sides of equal length where the opposite angles are the same, but none of the angles is equal to 90°: ¦.
He formed his hands into the shape of a ~.
N-COUNT
3.
Diamonds is one of the four suits of cards in a pack of playing cards. Each card in the suit is marked with one or more red symbols in the shape of a ~.
He drew the seven of ~s.
N-UNCOUNT-COLL
•
A ~ is a playing card of this suit.
N-COUNT