noun, di·a·mond often attributive \ˈdī-(ə-)mənd\

: a very hard usually colorless stone that is a form of carbon and is used especially in jewelry

: a shape that is formed by four equal straight lines and that has two opposite angles that are smaller than a right angle and two opposite angles that are larger than a right angle

: a playing card that is marked with a red diamond shape

Full Definition of DIAMOND

a :  native crystalline carbon that is the hardest known mineral, that is usually nearly colorless, that when transparent and free from flaws is highly valued as a precious stone, and that is used industrially especially as an abrasive; also :  a piece of this substance
b :  crystallized carbon produced artificially
:  something that resembles a diamond (as in brilliance, value, or fine quality)
:  a square or rhombus-shaped figure usually oriented with the long diagonal vertical
a :  a playing card marked with a stylized figure of a red diamond
b plural but sing or plural in constr :  the suit comprising cards marked with diamonds
:  a baseball infield; also :  the entire playing field

Examples of DIAMOND

  1. a necklace studded with diamonds and rubies
  2. The ruby was surrounded by a ring of diamond.
  3. The children cut the fabric into diamonds.
  4. one heart, two diamonds, and two clubs
  5. He played the queen of diamonds.

Origin of DIAMOND

Middle English diamaunde, from Middle French diamand, from Late Latin diamant-, diamas, alteration of Latin adamant-, adamas hardest metal, diamond, from Greek
First Known Use: 14th century



Definition of DIAMOND

transitive verb
:  to adorn with or as if with diamonds

First Known Use of DIAMOND




: of or relating to the 60th or 75th anniversary of an important event (such as a marriage)

Full Definition of DIAMOND

:  of, relating to, or being a 60th or 75th anniversary or its celebration <diamond jubilee>

Examples of DIAMOND

  1. the celebration of Queen Victoria's diamond jubilee in 1897

First Known Use of DIAMOND



biographical name Di·a·mond \ˈdī-(ə-)mənd\

Definition of DIAMOND

Peter A(rthur) 1940– Am. econ.


geographical name Di·a·mond \ˈdī-(ə-)mənd\

Definition of DIAMOND

mountains SE North Korea; highest 5374 feet (1638 m)

Variants of DIAMOND

Di·a·mond or Kum·gang \ˈkm-ˌgäŋ\
DIAMOND Defined for Kids


noun di·a·mond \ˈdī-ə-mənd, ˈdī-mənd\

Definition of DIAMOND for Kids

:  a very hard mineral that is a form of carbon, is usually nearly colorless, and is used especially in jewelry
:  a flat figure {loz} like one of the surfaces of certain cut diamonds
:  infield 1
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