Definition of diamond noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈdaɪəmənd//
    ; NAmE NAmE//ˈdaɪəmənd//
    Baseball, Card games, Jewellery
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  1. 1   [uncountable, countable] a clear 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. an old woman dripping with diamonds earrings encrusted with diamonds see also rough diamond See related entries: Jewellery
  2. 2   [countable] a shape with four straight sides of equal length and with angles that are not right angles
  3. 3 diamonds [plural, uncountable] one of the four suits (= sets) in a pack / deck of cards. The cards are marked with red diamond shapes. the ten of diamonds Diamonds are/is trumps. See related entries: Card games
  4. 4[countable] a card of this suit You must play a diamond if you have one.
  5. 5[countable] (in baseball) the space inside the lines that connect the four bases; also used to mean the whole baseball field See related entries: Baseball
  6. Word OriginMiddle English: from Old French diamant, from medieval Latin diamas, diamant-, variant of Latin adamans from Greek adamas, adamant-, ‘untameable, invincible’ (later used to denote the hardest metal or stone, hence diamond), from a- ‘not’ + daman ‘to tame’.
See the Oxford Advanced American Dictionary entry: diamond