diamond [dahy-muh nd, dahy-uh-]
1. a pure or nearly pure, extremely hard form of carbon, naturally crystallized in the isometric system.
2. a piece of this stone.
3. a transparent, flawless or almost flawless piece of this stone, especially when cut and polished, valued as a precious gem.
4. a ring or other piece of jewelry containing such a precious stone, especially an engagement ring.
5. a piece of this stone used in a drill or cutting tool.
6. a tool provided with such an uncut stone, used for cutting glass.
7. crystallized carbon, or a piece of it, artificially produced.
8. an equilateral quadrilateral, especially as placed with its diagonals vertical and horizontal; a lozenge or rhombus.
9. any rhombus-shaped figure or object oriented with its diagonals vertical and horizontal.
10. a red rhombus-shaped figure on a playing card.
11. a card of the suit bearing such figures.
12. diamonds, (used with a singular or plural verb) the suit so marked: Diamonds is trump. Diamonds are trump.
a. the space enclosed by home plate and the three bases; infield.
b. the entire playing field.
14. Printing. a 4½-point type of a size between brilliant and pearl.
15. made of or set with a diamond or diamonds.
16. having the shape of a diamond: a dress with a diamond print.
17. indicating the 75th, or sometimes the 60th, event of a series, as a wedding anniversary.
verb (used with object)
18. to adorn with or as if with diamonds.
19. diamond in the rough, a person of fine character but lacking refined manners or graces.
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Origin: 1275-1325; Middle English diamant < Old French < Vulgar Latin *diamant-, stem of *diamas, perhaps alteration of *adimas (> French aimant magnet, Old Provençal aziman diamond, magnet), for Latin adamas adamant, diamond
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