diamond/ˋdaIəmənd; ˈdaIəmənd/n 1 [C,U] a very hard, clear, valuable stone, used in jewellery 钻石﹐金刚石: a diamond ring 钻石戒指2 [C] a shape with four straight but sloping sides of equal length that stands on one of its points 菱形3 diamonds [plural 复数] in card games, the cards with red diamond shapes on them〔纸牌中的〕方块: the ace of diamonds 方块 Asee picture at见 PLAYING CARD 图4 [C] the field where people play BASEBALL 棒球场