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di·a·mond  (d-mnd, dmnd)
1. An extremely hard, highly refractive crystalline form of carbon that is usually colorless and is used as a gemstone and in abrasives, cutting tools, and other applications.
2. A piece of jewelry containing such a gemstone.
3. A figure with four equal sides forming two inner obtuse angles and two inner acute angles; a rhombus or lozenge.
4. Games
a. A red, lozenge-shaped figure on certain playing cards.
b. A playing card with this figure.
c. diamonds (used with a sing. or pl. verb) The suit of cards represented by this figure.
5. Baseball
a. An infield.
b. The whole playing field.
Of or relating to a 60th or 75th anniversary.
tr.v. di·a·mond·ed, di·a·mond·ing, di·a·monds
To adorn with or as if with diamonds.
diamond in the rough
One having exceptionally good qualities or the potential for greatness but lacking polish and refinement.

[Middle English diamaunt, from Old French diamant, from Medieval Latin diams-, diamant-, alteration of Latin adams; see adamant.]

diamond [ˈdaɪəmənd]
1. (Earth Sciences / Minerals) (Clothing, Personal Arts & Crafts / Jewellery)
a.  a colourless exceptionally hard mineral (but often tinted yellow, orange, blue, brown, or black by impurities), found in certain igneous rocks (esp the kimberlites of South Africa). It is used as a gemstone, as an abrasive, and on the working edges of cutting tools. Composition: carbon. Formula: C. Crystal structure: cubic
b.  (as modifier) a diamond ring Related adj diamantine
2. (Mathematics) Geometry
a.  a figure having four sides of equal length forming two acute angles and two obtuse angles; rhombus
b.  (modifier) rhombic
3. (Group Games / Card Games)
a.  a red lozenge-shaped symbol on a playing card
b.  a card with one or more of these symbols or (when plural) the suit of cards so marked
4. (Team Sports / Baseball) Baseball
a.  the whole playing field
b.  the square formed by the four bases
5. (Communication Arts / Printing, Lithography & Bookbinding) (formerly) a size of printers type approximately equal to 4½ point
(Earth Sciences / Minerals)
black diamond a figurative name for coal
rough diamond
a.  (Earth Sciences / Minerals) an unpolished diamond
b.  a person of fine character who lacks refinement and polish
(Clothing, Personal Arts & Crafts / Jewellery) (tr) to decorate with or as with diamonds
[from Old French diamant, from Medieval Latin diamas, modification of Latin adamas the hardest iron or steel, diamond; see adamant]
diamond-like  adj

diamond  (d-mnd)
A form of pure carbon that occurs naturally as a clear, cubic crystal and is the hardest of all known minerals. It often occurs as octahedrons with rounded edges and curved surfaces. Diamond forms under conditions of extreme temperature and pressure and is most commonly found in volcanic breccias and in alluvial deposits. Poorly formed diamonds are used in abrasives and in industrial cutting tools.

diamond  /damnd, damnd/  n.adj. 1 [C;U] the hardest gemstone, made of colorless carbon and very valuable: What a beautiful diamond ring! 2 [C] a figure with four straight sides and pointed at the top, bottom, and sides 3 [C] a playing card with one or more red diamonds: the six (king, ace, etc.) of diamonds 4 [C] a baseball playing field diamond

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