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English definition of “diamond”

diamond

noun uk   /ˈdaɪə.mənd/ us  

diamond noun (STONE)

B2 [C or U] a transparent, extremely hard precious stone that is used in jewellery, and in industry for cutting hard things: The tiara was set with diamonds and rubies. a diamond ring/necklace He had worked in the diamond mines of South Africa. diamond-tipped saw blades diamonds [plural noun] jewellery made from diamonds: Shall I wear the diamonds or the pearls with this dress?

diamond noun (SHAPE)

B2 [C or U] a shape with four straight sides of equal length, forming two opposite angles that are wide and two that are narrow: Joe's socks had diamond patterns on them. [C] the square part of a field on which baseball is played, surrounded by the four bases, or the whole field on which the game is played

diamond noun (CARDS)

diamonds [plural or U] one of the four suits in playing cards, shown by one or more red symbols in the shape of a diamond: the six/jack of diamonds [C] a playing card from the suit of diamonds: She played a diamond.
(Definition of diamond from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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