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diamond | meaning of diamond in Longman Dictionary of Contemporary English | LDOCE

From Longman Dictionary of Contemporary EnglishJewellery, Shapes, patterns, Baseballdiamonddi‧a‧mond /ˈdaɪəmənd/ ●●○ S3 noun    1 STONE[countable, uncountable]DCJ a clear, very hard valuable stone, used in jewellery and in industry  a diamond engagement ring2 SHAPE[countable]CF 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.3 ON A PLAYING CARD a) DGC 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 ittwo/queen etc of diamonds  the ace of diamonds b) [countable]DGC a card from this suit  You have to play a diamond.4 SPORTS FIELD[countable] a) DSBthe area in a baseball field that is within the diamond shape formed by the four bases b) DSBthe whole playing field used in baseballExamples from the Corpusdiamonda diamond necklaceThe beautiful diamond ring had gone.We had beautiful chandeliers, women in diamonds and mink stoles.After washing and change of lap paper, polishing is continued with 1 µm diamond.the king of diamondsWeighed down with rubies, sapphires, emeralds, pearls, diamonds.Because the diamond is absorbing blue light, it appears yellow in ordinary light.With clubs wide open to make the contract you're going to need to try and bring the diamonds in without loss.Origin diamond (1200-1300) Old French diamant hard metal, diamond, from Greek adamas; → ADAMANT