|Origin:||diamant 'hard metal, diamond', from Greek adamas; ADAMANT|
1 [uncountable and countable]DCJ
a clear, very hard valuable stone, used in jewellery and in industry:
a diamond engagement ring
a shape with four straight but sloping sides of equal length, with one point facing directly up and the other directly down:
Cut the cookie dough into diamonds.
one of the four suits (=types of cards) in a set of playing cards, which has the design of a red diamond shape on it
two/queen etc of diamonds
the ace of diamonds
a card from this suit:
You have to play a diamond.
the area in a baseball field that is within the diamond shape formed by the four bases
the whole playing field used in baseball