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See also: Diamond


A diamond (2), (3)


From Old French diamant, from Late Latin diamas, from Latin adamas, from Ancient Greek ἀδάμας (adámas, diamond).



diamond (plural diamonds)

  1. (uncountable) A glimmering glass-like mineral that is an allotrope of carbon in which each atom is surrounded by four others in the form of a tetrahedron.
    The saw is coated with diamond.
  2. A gemstone made from this mineral.
    • 2012 March 1, Lee A. Groat, “Gemstones”, American Scientist, volume 100, number 2, page 128: 
      Although there are dozens of different types of gems, among the best known and most important are diamond, ruby and sapphire, emerald and other gem forms of the mineral beryl, chrysoberyl, tanzanite, tsavorite, topaz and jade.
    The dozen loose diamonds sparkled in the light.
  3. A ring containing a diamond.
    What a beautiful engagement diamond.
  4. A very pale blue color/colour.
    diamond color:    
  5. Something that resembles a diamond.
  6. (geometry) A rhombus, especially when oriented so that its longer axis is vertical.
  7. (geometry) The polyiamond made up of two triangles.
  8. (baseball) The entire field of play used in the game.
  9. (baseball) The infield of a baseball field.
    The teams met on the diamond.
  10. (card games) A card of the diamonds suit.
    I have only one diamond in my hand.
  11. (printing, dated) A kind of type in English printing, the smallest except for brilliant.



  • (baseball: infield of a baseball field): outfield

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diamond (not comparable)

  1. made of, or containing diamond, a diamond or diamonds.
    He gave her diamond earrings.
  2. of, relating to, or being a sixtieth anniversary.
    Today is their diamond wedding anniversary.
  3. of, relating to, or being a seventy-fifth anniversary.
    Today is their diamond wedding anniversary.



diamond (third-person singular simple present diamonds, present participle diamonding, simple past and past participle diamonded)

  1. to adorn with or as if with diamonds


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