diamond

1. N-VAR A diamond is a hard, bright, precious stone which is clear and colourless. Diamonds are used in jewellery and for cutting very hard substances. 钻石

...a pair of diamond earrings. …一对钻石耳环。

2. N-COUNT A diamond 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°: ♦. 菱形

...forming his hands into the shape of a diamond. …用他的双手比划出一个菱形。

3. N-UNCOUNT-COLL 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 diamond. 方块 (扑克牌中的4个花色之一)

He drew the seven of diamonds. 他抽了方块7。

4. N-COUNT A diamond is a playing card of this suit. (扑克牌中的) 方块牌

...win the ace of clubs and play a diamond. …赢了梅花A，打出一张方块。

5. N-COUNT In baseball, the diamond is the square formed by the four bases, or the whole of the playing area. (棒球) 内野; 棒球场[usu 'the' N]

He would be the best ever to walk out onto the diamond. 他将是棒球场上最出色的球员。

Just drive around the city and see all the empty baseball diamonds there are. 就开车在城里转转，看看所有空闲的棒球场。