diamond

Universal Words noun 1 [U,C] a clear colourless precious stone of pure CARBON, the hardest substance known. Diamonds are used in jewellery and also in industry, especially for cutting glass: a ring with a diamond in it * a diamond ring / necklace * She was wearing her diamonds (= jewellery with diamonds in it). * The lights shone like diamonds. seealsoROUGHDIAMOND 2 [C] a shape with four straight sides of equal length and with angles that are not RIGHTANGLES 3 (diamonds) [pl.,U] one of the four SUITS (= sets) in a pack/deck of cards. The cards are marked with red diamond shapes: ten of diamonds * Diamonds are / is trumps. 4 [C] a card of this SUIT: You must play a diamond if you have one. 5 [C] (in baseball) the space inside the lines that connect the four BASES; also used to mean the whole baseball field