I. ˈdī-(ə-)mənd noun
Usage: often attributive
Etymology: Middle English diamaunde, from Middle French diamand, from Late Latin diamant-, diamas, alteration of Latin adamant-, adamas hardest metal, diamond, from Greek
Date: 14th century
1.
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
2. : something that resembles a diamond (as in brilliance, value, or fine quality)
3. : a square or rhombus-shaped figure usually oriented with the long diagonal vertical
4.
a. : a playing card marked with a stylized figure of a red diamond
b. plural but singular or plural in construction : the suit comprising cards marked with diamonds
5. : a baseball infield ; also : the entire playing field
II. transitive verb
Date: 1751
: to adorn with or as if with diamonds
III. adjective
Date: 1872
: of, relating to, or being a 60th or 75th anniversary or its celebration
diamond jubilee